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Electric Sailboat Motor: Range, Cost, Best Kits for Conversion

Today, owning a completely green sailboat has been made possible with electric sailboat motors.

Imagine cruising with the silence of an electric sailboat motor and the ease of use with a simple press on the start button. What’s better is there are no exhaust fumes at all with significantly less maintenance.

It’s so appealing that a lot of sailing liveaboards have made their electric sailboat motor conversion.

However, some sailors are still on the fence, worrying about the range and price of the electric sailboat motor.

If you are one of them, you are in the right place!

This post will guide you through every aspect you need to know about electric sailboat motors to help you make an informed decision.

Besides, you will get professional insights on how to make the electric sailboat motor conversion for your own boat and learn the best electric sailboat motors (with honest reviews).

Table of contents:

• Electric Sailboat Motors: Confusion Explained

Electric Sailboat Motor or Combustion Motor

• Electric Yacht Motor Conversion: Two Solutions
• How to Size an Electric Sailboat Motor

Best Electric Sailboat Motors (with Reviews)

Electric Sailboat Motor: Confusion Explained

Can you go cruising with an electric sailboat motor? Can you put an electric motor on a sailboat? Are there any limitations?

Whether electric sailboat motors are a good fit for your boat is not a YES or NO question. Here we will explain your top worries with statistics and facts. That way, you can make a wise decision according to your situation.

You may hear some complaints about the batteries and range of the electric propulsion.

However, their experience may not suit electric sailboat motors.

In fact, even small electric engines work pretty well in many sailboats. That’s because most of the time, the wind can power the boat, and the motor is just used for docking or in rare times when there is no wind.

Therefore, it makes more sense to learn electric sailboat motor performance in real-world applications.

Here is a test report of a 3 HP electric sailboat motor on an RS21 racing sailboat:

As you can see, the small electric sailboat motor can run at 5.5 mph top speed for one hour continuously.

And there is a big difference in terms of range vs speed for electric sailboat motors:

If you lower the speed, the range and runtime can be greatly extended. The slower you go, the further you’ll get. For example, if you cut your speed in half, the electric sailboat motor can last 7 hours and go 20 miles within one charge.

That’s pretty sufficient if you use the electric yacht motor mostly for docking or as an auxiliary engine.

Faster top speed (and more range) is available with higher power electric sailboat motors depending on your specific requirements. Contact a specialist to design your electric sailboat motor solutions.

Also, don’t forget to get the electric sailboat motor with regeneration (See recommendations below).

That’s to say, when there is a lot of wind and you’re moving rapidly via your sails, they regenerate and store electric power on the batteries to keep you moving at other times. Solar recharging is also a plus.

Essentially, the range depends on how many batteries you have, so it’s not a limitation of electric sailboat motors but energy and batteries.

If you are still worried, you can offset this by getting a diesel generator, which is more efficient than a diesel engine. And it is a range extender when you need it, but for 90% of your motoring that you don’t need the range, you can rely on the electric sailboat motor.

Some of you might be concerned about the extra weight of the batteries.

In fact, an electric sailboat motor with lithium batteries weighs less than a diesel engine, particularly if you include the fuel weight.

If you want a lightweight electric sailboat motor solution, make sure you get one with LiFePO4 batteries . Compared with other marine batteries, they are more compact in design with much less weight and higher energy density.

Some more advanced electric motors for small sailboats (such as Spirit 1.0 Evo) feature an integrated lightweight battery. So you don’t need to worry about the complex wiring to hook it up or extra space to store the battery.

This is a huge plus if you want to use the electric sailboat motor on a tender or dinghy.

Here is also a chart that collects the weight of some popular electric sailboat motors for your reference:

For many people, another big problem with electric sailboat motors is the cost.

It’s true that a gasoline outboard with similar power is a lot cheaper to buy. However, the electric sailboat motor eventually wins in long-term operating cost. That’s especially the case if you are going to do a lot of motoring.

Electric sailboat motors save on fuel and maintenance costs, which can build up to a large amount over time.

Here is a chart that compares the cost of a 3HP electric sailboat motor (coming with a built-in battery) with its combustion counterpart:

That’s to say, you will cover the price difference for electric yacht motors eventually as long as you use it long enough. Click to check the details of the calculation .

What makes the electric sailboat motor even more worthwhile is it saves you a lot of hassles, especially for sailors who only use the engine in and out of the harbor. Dealing with the maintenance of the gas outboard for a 10 minute motor out of and into the harbor is disproportionate and painful.

*The higher horsepower electric sailboat motor may be different in terms of the cost calculation. Check out the outboard motor pricelist by HP for more information.

As you may have already noticed, electric propulsion has already been widely used in the marine industry:

It’s quiet while motoring, clean to handle, environmentally friendly, with less maintenance and operation costs.

The electric sailboat motors are easier to use with dramatically fewer moving parts to break and no worries about being a diesel mechanic to deal with the hard pulling start. You can have it always on, so it is ready whenever you need it.

And it makes even more sense in sailing applications:

You don’t really need to motor much if your plan is to actually sail. If you are completely becalmed, you will probably just need to motor at 2 knots to keep making way, which is easy for electric sailboat motors.

If you mostly use the motor to get into and out of the harbor, the electric sailboat motor also works great for you.

You can always charge up at the dock, motor out of the marina (or even motor to your sailing area or race start), then hoist the sails and when you’re through, the batteries are charged again.

The electric sailboat motor is also useful as a backup (kicker) motor in case your system goes down. That’s why you can see people pushing a lot of big boats with small electric motors. (Click to learn more information about kicker motors .)

Personally, it’s really nice to have an electric auxiliary in the boat – no smelly, messy diesel and motor oil to deal with, a much simpler system with less maintenance, and much, much quieter operation.

However, powerboats tend to have much higher requirements in terms of both power output and runtime. In that case, an electric sailboat motor can be hard to satisfy your needs.

How Do You Size an Electric Motor for a Sailboat?

As a rule of thumb, you will need approximately 1 HP per 550 lb of the displacement of your boat.

Generally speaking, a 3 HP electric sailboat motor can push a sailboat up to 25 ft and a 9.9 HP motor is sufficient for a 30 ft sailboat to motor at a satisfying speed.

However, bear in mind the horsepower you need always depends on your needs and applications.

It’s better to check the data from real-world tests to decide whether the electric sailboat motor is suitable for your specific needs.

For example, the 9.9 HP electric sailboat motor Navy 6.0 allows you to go at 6.9 mph (11.1 kph) on a 30 ft sailboat, and the range can be extended to 46.4 miles if you decrease your speed to 2.9 mph (4.6 kph).

Click to see more test reports with other electric motor and sailboat combinations, and find the electric sailboat motor that suits you best.

If you are still not sure about the size of the electric sailboat motor for you, feel free to leave us a comment and we will get back to you ASAP with professional suggestions.

Electric Sailboat Motor Conversion

Basically, there are two ways for you to convert your sailboat to a clean and quiet electric drive system:

You can either convert your current vessel to electric or buy an engineless yacht and install an electric sailboat motor on your own.

#1. Repower Your Sailboat with Electric Motor

If you decide to replace the diesel engine with an electric motor, you will need to do a lot of preparations:

The DIY approach requires an electric sailboat motor kit (including motor and controller), batteries, a good level of mechanical ability and basic electrical knowledge, as well as some common tools such as a voltmeter.

You will need to take the old engine out for the new electric sailboat motor installation. It’s not an easy task that involves removing the engine mounts and the drive shaft (dealing with the numerous hoses and cables), taking out the engine, exhaust system, fuel tank, and its attendant tubes, etc.

Remember to balance the boat to avoid listing during the electric sailboat motor conversion.

Then in with the new electric sailboat motor. The installation process can be straightforward if you choose the electric sailboat motor kit wisely (See steps below). Furthermore, you can set up solar charging for your electric sailboat motor with solar panels and charger.

Many sailors have recorded their electric sailboat motor conversion process and experience. Be sure to check them out to get some inspiration. For example, Ed Phillips has documented everything which can serve as a guide for newbies to get started.

Mind you there can be a whole heap that can go wrong in designing and maintaining the electric sailboat motor systems. You really need to be totally on top of it if you want decent performance or reliability.

If you are not that technically inclined, it’s better to talk to a specialist first to discuss your plan for a smooth electric sailboat motor conversion.

#2. Install an Electric Motor in a Sailboat

If you own an enginless sailboat, the electric sailboat motor conversion is much easier for you.

All you need to do is to find a reliable electric sailboat motor and install it in simple steps. The whole process can be easily done, even for beginners. Here we take the popular 6 HP electric sailboat motor Navy 3.0 as an example to show you the installation process:

• Step 1 : Rotate the clamps or use the screws to fix the outboard onto the sailboat.
• Step 2: Mount the steering system in the proper position.
• Step 3: Install the tiller on the electric sailboat motor.
• Step 4: Connect the batteries to the electric sailboat motor system.

Click to check the video tutorial that guides you through each step of the installation.

If you are worried about aesthetic issues and want higher horsepower options, an electric inboard motor can be a better suit for your sailboat. If you prefer an inboard motor for your sailboat, contact our OEM team to get an electric propulsion solution tailored to your needs.

Note : You might find some electric trolling motors rated by #s of thrust on the market. Actually, those electric trolling motors for sailboats can only provide limited speed and range. If you are heading into the wind, the trolling motors for sailboats are definitely not an ideal solution.

Once you’ve evaluated if electric sailboat motors are right for you, there are a lot of options for electric systems.

Here are some popular electric sailboat motors with positive reviews from customers worldwide. Fast charger is available for all the models recommended to reduce your charging stress.

#1. 3 HP Spirit 1.0 Evo

If you are looking for an electric motor for a small sailboat, be sure to check out the ePropulsion Spirit 1.0 Evo. It’s suitable for large daysailers or small cruising sailboats under 25 ft.

With the Spirit 1.0 Evo electric sailboat motor, you can go 5.5 mph (8.8 kph) at top speed on the 21 ft RS21 sailing boat, or troll for 20 hours continuously at 2.2 mph (3.5 kph) according to our test .

This electric sailboat motor with regeneration allows you to recover energy from the prop while under sail. It will start to generate power automatically when the sailing speed reaches 2 knots.

As an electric auxiliary sailboat motor, it can also be easily installed on your tender boats or yacht dinghies since it’s portable and easy to transport (with a lightweight integrated battery).

Features You Will Love:

• Come with the industry-first hydrogeneration capability
• Direct-drive technology makes it maintenance-free
• Portable with a 1276Wh large integrated lithium battery for long range
• Safety wristband keeps you safe in case of MOB
• Digital operation keeps you informed of the battery status

Spirit 1.0 Evo Electric Sailboat Motor Reviews:

“Great weekend with my 17′ sailboat powered by the Spirit Evo. This is great. Quiet and reliable. Went at 3/4 throttle for about 1.5hrs when taking it back to boat ramp.” – Robert Taylor

“Very happy with our Spirit Plus. Pushing our Kolibri 560 a 750 Kg sailboat, with ease. Doing about 5.8 km/h at 500W.” – Frank van Asten

#2. 6HP/9.9 HP Navy Evo Series

If you want a little more juice on the electric sailboat motor, check out the ePropulsion Navy Series. It offers 6 HP and 9.9 HP models for your selection and it provides sufficient power for sailboats up to 30 ft.

According to our test , the 6 HP electric motor Navy 3.0 can push the Catalina 25 sailboat (25 ft) at 6 mph (9.6 kph) top speed, while the Olga 33 sailboat (33 ft) can go at 7.5 mph (12 kph) with the 9.9 HP Navy 6.0 motor.

The Navy series electric sailboat motor also comes with regeneration features which can be recharged with hydrogeneration, wind turbine, and solar panel.

• Four controls to fit your sailboat installation and your boating style
• Accompany LiFePO4 batteries (need separate purchase) are more energy efficient
• Digital display offers real-time monitoring of the power and battery
• Magnetic kill switch and safety wristband keep you safe on the boat
• Electric start saves you trouble pulling the cord to start

Navy Series Electric Sailboat Motor Reviews:

“I have a Navy 3.0 with E80 on a Catalina 25 sailboat. It is working well. Currently I am using about 4% battery to go in/out of the marina by boat.” – Aaron Young

“Just finished my 8 weeks sailing journey in the Baltic Sea. The two Navy 3 outboards provide enough power for my 33ft catamaran. The 400W solar panels provided enough energy for engines and all other energy consumed on board with 2-6 persons. The two Navy Batteries provide power for engines and all other on-board electric devices. I never had to use shore power, so totally self-sufficient electric system.” – Martin Hildebrand

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Things to Consider When Repowering With Electric Motors

• By Capt. Vincent Daniello
• August 7, 2023

Much reporting focuses on reasons why one might choose electric marine power. The issues of range, speed, noise levels, winterizing and ethanol challenges, lake restrictions, environmental concerns and more all must be resolved on an individual basis. Little gets said about how a boater choosing to repower with electric actually gets that accomplished. Is it DIY? And if not, how does it get done?

Are you considering repowering with electric? Here’s a look at what it takes to cut the fuel line and plug in.

How Fast, How Far and How Long?

Electric propulsion can provide speed, range and runtime, but not all at once. An electric boat, motor and battery combination might top 25 mph for an hour. The same boat can also travel more than 50 miles at 6 mph, or longer still at slower speed. That makes the first step in going electric determining how far, in miles, you want to go fast, and how long, in hours, you need to go slow. Then match a motor and batteries to suit.

Portable Propulsion (DIY)

For small boats pushed to modest speeds, small, light options from ePropulsion , Torqeedo and Elco —equivalent to 3 hp gas outboards—easily clamp onto a transom yet store within a lazarette without worry of spilled gas. Most go for about an hour at full throttle, or 90 minutes at cruising speed, from one integrated or small external battery. These range from $2,500 to $3,500 for the motor, battery and charger.

Hardwired ­Horsepower (DIY or Dealer)

Elco, Torqeedo, ePropulsion and Flux offer motors equivalent to gas outboards from 5 hp to 25 hp. These typically connect to fixed battery banks mounted aboard. Most companies offer self-installation packages that call upon basic mechanical skills. All facilitate turnkey installation through dealer networks. Flux eliminates DIY installation, partly because its outboards utilize higher voltages than ­others in this ­horsepower range. 

These midsize motors tend to work best for bigger boats at slower speeds. Elco, for example, says its EP-20 can push a 24-foot pontoon boat about 8 mph for two hours, while the same charge provides more than 10 hours of battery life at 5 mph; the cost is around $11,500. Just be sure to choose adequate power to dock in a breeze and then back off the throttle to extend range.

Planing Power (Dealer, Some DIY)

Elco, Torqeedo and Flux offer motors comparable to ICE outboards from 30 hp through 100 hp. Most utilize twice the operating volts compared to companies’ smaller outboards, with those added volts providing more short-term power, which is needed for the few high-load moments while boats climb fully onto plane. Only Elco facilitates DIY installation within this power range, even offering pre-made cables, equipment and accessories. The complete package propelling Rock Proof’s ePro 1760R , a boat we tested in Boating ’s March 2023 issue, utilizes Elco’s EP-50 and 20 kWh of lithium batteries; it sells for about $22,500.

Inboard Options (Dealer, Some DIY)

While Elco has offered modern electric-­propelled launches since 1987 and inboard repower options since 2009, its newest inboard motors are one-third smaller and half the weight of previous models, illustrating industry trends. Torqeedo and, recently, ePropulsion also offer powerful, light inboard motors for either repower or OEM installation. Most are intended to operate at modest speed, although Torqeedo offers three models operating at higher rpm for planing boats—its largest replaces 135 hp ICE engines while weighing one-third of a comparable ICE inboard motor and transmission (195 pounds plus batteries versus 567 pounds for a 135 hp MerCruiser 3.0 bobtail). A ­complete system with batteries that can run 50 minutes at full throttle costs about $120,000.

Read Next: Going Electric to Repower an Antique Boat

Electric motors ranging from 5 hp to 25 hp typically operate at 24 or 48 volts. This provides the broadest battery choices to balance size, weight, range and cost. All Elco and many Torqeedo motors accommodate any brand or battery type that meets specifications, adding flexibility. Absorbed glass mat (AGM) batteries , for instance, save considerable dollars compared to lithium for slow-speed boats. Larger motors, particularly when boats approach planing speed, require lithium batteries, which are half the weight yet provide higher continuous output compared to AGM.

• More: August/September 2023 , Boats , elco , electric boats , Engines , torqeedo

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Aging Power Plants: Rebuild or Repower?

• By Tim Murphy
• Updated: October 22, 2012

Many sailboats built two decades ago or earlier still have plenty of life left in them. But their engines may not. Grey Marine, Palmer, Perkins, Buhk, Universal, Pathfinder, Faryman—these once-common names in marine propulsion are all but gone from newer boats. Many of these engines were designed as truck or tractor motors, then retrofitted for marine use. The question facing you now is: Should you rebuild the existing engine? Or repower with a brand-new engine?

Let’s start with the cost of repowering. “You’re talking probably between $12K and $16K for a 30-footer, and $18K to $22K for a 40- to 45-footer,” says Mike Muessel of Oldport Marine, in Newport, Rhode Island, who’s repowered dozens of boats.

Expensive? Yes. But before you dismiss that option, first account for the real costs of a rebuild. “When people talk about rebuilding an engine, they usually mean rebuilding the internals—new pistons and rings and so forth,” says Muessel. Too often, he says, they forget to tally the cost of all the auxiliary parts: the starter ($400 to $800), alternator ($400 to $800), heat exchanger ($1,200), and saltwater pump ($500). Add a wiring harness, engine gauges, switch panel, transmission, and injection pump, plus labor, and the costs of a rebuild start to compete. It’s not uncommon, Muessel says, to spend 60 percent of the cost of repowering on a rebuild. And you’re still left with an older engine that’s long out of warranty.

If you’re shopping for an older boat, take a good mechanic with you on the sea trial and get a thorough assessment of the engine’s condition. With that firsthand information, factor the real costs of a dependable power plant into your final negotiations for the boat.

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Repowering Your Boat: What You Need To Know

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There are many considerations when starting a repower project, including some that are unrelated to the performance requirements of your boat.

These five below, should give you a good starting point from which to plan your shopping list.

Transom Limitations: Space and Weight

The physical limitations of your transom will dictate how much horsepower and weight you can put back there. While modern four-strokes are getting close to their two-stroke counterparts in weight, they still will add to the load at the stern. If you were not running the maximum-rated horsepower in your previous set up, you may have some wiggle room, and be able to absorb some extra weight without impacting seaworthiness. It's a good idea to check with your boatbuilder what the design limitations were before you start shopping. Weight considerations could limit you to DI two-stroke technology.

Space is more of an issue if you are running twins (or more) because some of the high-horsepower modern four-strokes need more width between the engines, but not always. Honda, for example, designed their four-strokes to fit the standard footprint for easy repowers.

In addition, with the increased horsepower ratings available today, you may wish to switch from twins to a single outboard configuration. For example, swapping twin-150s for a single 300-hp motor, in theory, will reduce both weight and drag, which should increase fuel economy without sacrificing performance. However, boatbuilders caution that the increased power and torque of these modern, power-dense outboards can be too much for transoms that weren't designed for it. A safe bet is to limit horsepower to the highest horsepower single engine configuration offered as original equipment. The boatbuilder should be able to go into greater detail.

Rigging: Time To Upgrade To Electronic Controls?

This is your chance to simplify your dash and clean up the console, as well as consider adding joystick control, if you are running twins. If you've got a large multifunction display, you may also wish to network it to your outboard(s) to allow it to display engine data. To do so, you need to look for an outboard that supports NMEA standard data outputs or one that offers a "gateway" converter that changes proprietary outputs into a data stream that your chartplotter can use.

Converting to joystick control will also require hydraulic steering, and a specialized command bus to talk to the joystick.

How you intend to use your outboard? If you do a lot of trolling or low speed operation, you may benefit from an outboard that makes use of fuel saving tactics like stratified combustion. If you run offshore or through an inlet to go fishing, you may benefit from electronic throttle controls combined with an outboard with instantaneous mid-range punch.

Maintenance Schedules

Scheduled maintenance intervals have a big impact on the cost of ownership during the life of the outboard. In general, DI two-strokes will have longer intervals between scheduled services because they lack mechanically-controlled drive trains that need adjustment every 500 to 1,000 hours. Although recently Mercury unveiled a 150-hp four-stroke that should not require valve adjustments at all during it's lifetime. Four strokes also need regular oil changes. But annual oil changes should be weighed against the operating cost of burning oil in a DI two-stroke.

Electrical Demand

The amperage output of most outboards has increased over the years, but if you run an electric trolling motor all day, or a suite of electronics while drifting or slow-trolling, the alternator on your outboard better be able to keep up. Check not only the rated amperage output, but also make a note of what the output is a low rpm, where it could half of what it is a cruising speeds.

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Michael Vatalaro is the former executive editor of BoatUS Magazine. He has a Pursuit center console, which he uses in the Chesapeake Bay.

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Beta Marine Repower Center

Marine engines, whether or not they get a lot of use, wear down over time. They don’t run efficiently, they lose power, and they become a money drain. Replace your old, tired, outdated marine engine with a reliable Beta Marine diesel engine today. Use our resourceful Beta Marine repower center to find the right engine for your boat. There are lots of variables to consider when making a decision, such as the boat, engine bed, and how you plan to use the boat. Our consultants can help you make sense of all the variables. Choosing the correct engine to repower your sailboat depends upon several different criteria and we would always recommend that you discuss with other owners of your class of yacht as well as your local Beta Dealer or engine installer. Utilize the Beta Marine repower center to begin your search.

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Repowering a Boat: What You Should Know

Does your boat engine need to be replaced? If so, you should review the pros, cons, costs, and considerations for repowering a boat. Stay tuned to discover everything you need to know! 

What Does Repowering a Boat Entail?

So, what does repowering a boat mean? This term refers to replacing your old boat engine with a newer alternative. Doing so makes your vessel faster, more efficient, and less likely to break down. 

Pros of Repowering a Boat

As mentioned, repowering your boat helps it run faster and more efficiently. In addition, here are some of the benefits:

1. Improve Performance

Replacing your old engine with a new one is a phenomenal way to maximize your boat’s overall performance. Generally, repowering a boat improves the power-to-weight ratio (making your boat easier to handle), maximizes speed and power, and offers a more enjoyable boating experience overall. 

2. Extend the Boat’s Lifespan

 A properly-maintained boat engine lasts many years – extending your time on the water. And not only do newer engines feature advanced technology and higher-quality parts, but they allow for longer service intervals. That means they require less maintenance.

Read Next: Boat Maintenance Guide

3. Increase Resale Value

Thinking about selling your boat? (Either sooner or later?) Because the value of your boat increases when you replace your old engine with a newer, more powerful one. Generally, buyers are more interested in purchasing modern, efficient, and dependable vessels. 

4. Improve Fuel Economy

We probably don’t need to remind you that gas prices are increasing. However, newer engines allow you to spend less money on gas or fuel .

5. Better for the Environment

When repowering your boat, you can upgrade to an engine that uses less fuel and meets the current carbon pollution rules. Manufacturers make the newest machines to be as green as possible . And by reducing pollution, your boat becomes safer for the environment and the seas.  

Read Next: Responsible Boating Guide

Cons of Boat Repowering

Naturally, there are two sides to every coin. Here are some drawbacks of repowering: 

1. Boat Downtime Needed

Depending on the vessel’s size and the work’s complexity, the repowering process takes some time (several days or weeks.) Because you can’t operate your boat during that time, you must plan your schedule accordingly. 

2. Compatibility

Believe it or not, certain engines aren’t compatible with certain types of boats. Therefore, you must verify that your fuel and exhaust systems, buttons, gauges, and electrical links work with the new engine. And note that the price might increase depending on any necessary changes. 

3. Installation

Usually, you’ll need to hire professional marine technicians to handle a project of this size. They can verify that everything was done correctly and that the installation is successful. However, their expertise comes with a price, and hiring experts bumps the overall cost. 

4. Repowering Costs

So, how much does it cost to repower a boat? Typically, upgrading your boat’s power source costs several thousand dollars. However, your exact price depends on factors like boat size, engine type, installation fees, boat modifications, and additional equipment.

Our advice? Do your research and collect quotes from multiple sources. That way, you can thoroughly assess your options and select the one that works best for you. 

What to Consider:

Decided that it’s time to repower your boat? Before you do, there are a few considerations to keep in mind: 

• Maintenance : There’s no getting around it – new engines require ongoing maintenance! When factoring this into your decision, consider the proximity of repair shops, what the warranty includes, and how easy it is to reach customer service. 
• R egulations and emissions standards:  Every boater must adhere to the local regulations and emissions standards. To avoid legal problems, your new engine must comply with laws regarding engine pollution, noise levels, and environmental concerns. 
• Compatibility:  It’s important to remember that certain engine types aren’t compatible with certain boat models. And just because someone suggests an engine model doesn’t mean it will automatically work for you. 

The Bottom Line

The benefits far outweigh the cost of repowering your boat. And if you’ve decided to upgrade your boat’s power system, we hope this guide answers your questions. 

On the Discover Boating Blog, you'll find boating advice, maintenance guides, and buying tips for both seasoned pros and first-time boaters. If you’re interested in learning how to care for your new boat engine, how to choose the right marine fuel and oil, or about the life expectancy of your boat engine , head to the Articles & Inspiration section of our website. 

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Benefits of Repowering

Installing a new, technologically advanced YANMAR engine will instantly breathe new life into your boat.

With the right system, you will benefit from:

• Improved acceleration, power, and responsiveness
• Lower running costs and increased uptime
• Enhanced fuel efficiency and lower environmental impact
• Upgrade to the latest electronics, controls, and diagnostics with interconnectivity to modern multi-function displays
• An overall smoother, quieter, and more pleasurable boating experience

When to Consider Repowering

YANMAR marine engines are renowned for their durability and long lifespan. The point at which your YANMAR or other diesel system will need repowering cannot be determined based on the number of operational hours alone. An engine’s longevity is often subject to how regularly and consistently you run your system.

You should consider repowering if:

• Your existing engine is becoming increasingly unreliable
• You are losing horsepower
• The engine is consuming too much fuel
• Maintenance costs and downtime are rising

Depending on the complexity of the project, replacing an inboard engine can take between one to four weeks once it arrives at the yard. However, the more time and consideration that can be put into planning the repowering project beforehand will pay dividends when the installation starts.

This includes:

• Choosing your installation center
• Selecting your new engine
• Choosing new accessories/technology you may wish to include
• Allocating delivery time for all needed materials
• Identifying any additional work that might be required

Download Our Full Repower Guide

What engine do i need.

When determining the engine best suited to your repowering needs, there will be a number of things to consider, centered around the type of boat you own, what you are looking to gain, and your engine room space and current engine footprint.

Displacement hull vessels will normally require a like-for-like power output while planing hull boats, more sensitive to weight, may benefit from the improved power to weight ratio offered by modern diesel engines.

With the advances in technology and materials used in YANMAR’s modern engines, it is often possible to achieve the same or higher power output with a smaller and lighter engine, boosting both acceleration and top speed. However, keep in mind that a more powerful engine may require a different marine gear, stronger engine beds, larger prop shafts and propellers, additional fuel tank capacity, and reworking of the existing intake air and exhaust system.

It is best to consult with a certified YANMAR dealer to determine the right propulsion system for your needs.

Choosing the Right Installer

A successful repowering project relies on two key aspects: selecting the correct engine for your boat and commissioning a qualified YANMAR installer.

Finding a technician with the right level of expertise and skill will help achieve a great outcome. The following tips are a guide to how you can make this selection process as smooth as possible.

• Only commission an installer who has visited and inspected your vessel.
• A competent installer should ask relevant questions about your boat and how you operate it.
• Look for an installer who has repowered vessels and/or completed projects of a similar scale.
• Ask for references that you can visit or speak with, as well as research the overall reputation of the yard.
• Make sure that an installer’s work conforms to all relevant regulations and legislation.
• Ensure that you receive a detailed quotation and a full breakdown of technical costs. On occasion, certain costs may be difficult to define upfront, such as converting a gasoline tank to diesel. However, these should be discussed in detail before work commences.

Rebuild vs. Repower

Rebuilding an existing engine(s) is an alternative option to repowering. This route is commonly perceived to be an easier and less costly choice. However, this may not always be the case, and if it is, these may only be short-term benefits.

Many existing parts are often not replaced during a rebuild. These parts can include, but are not limited to, the alternator, starter, and water pump. The remaining life expectancy of these parts cannot be predicted and could require further maintenance, downtime, and expense. Rebuilding an engine could also take more time and could present additional, unexpected costs.

By contrast, the installation of a new YANMAR engine guarantees that all of the components are new and the system is covered by our extensive manufacturer’s warranty. It will also likely incorporate the latest state-of-the-art technology, which will deliver rewards on both an economic and performance level.

Ultimately, the decision between the two options relies on individual circumstances and requirements. Consider this: if a rebuild is going to cost about 40% or more than the amount to install a new engine, then repowering may be a sounder investment.

Cost vs. Value

Repower your boat because you plan to keep it and reap the benefits of the new engine yourself. The value of your boat will certainly increase with a new engine, but rarely enough to recoup the costs immediately if you are only repowering with the intent to sell. The same is generally true if you convert from gas to diesel. The boat’s value will increase, but not likely enough to fully pay for the conversion.

Repower Because of Engine Failure

When an engine goes down, you need to repower your vessel regardless of choice. Whether your boat is used for recreation or for light duty commercial purposes, our goal is to get you back on the water as quickly as possible.

• What if I have multiple engines and only one goes down? If one engine fails and needs repowering, consider the remaining life expectancy of the other engine. If the other engine is nearing its end of lifespan, it is best to replace both engines at the same time. When replacing both engines, we recommend upgrading to the latest engines to benefit from the performance and efficiency gained by the latest advances in technology. If the other engine still has about 50% or more life expectancy, replacing only the down engine might be the best choice. 

Emissions Compliance

If your boat has an engine(s) not currently compliant with the latest emissions regulations, there are several things to consider when repowering.

Is there a current emission compliant engine model that fits the power requirements and space needs of your boat?

• If yes, it is highly recommended by the emissions governing authorities to repower with engines meeting current emissions regulations. There are some cases where exceptions can be made. Please contact your regional dealer or distributor to inquire.
• If there is not a current emission compliant engine that fits your boat without significant modifications, then you might qualify for a non-compliant replacement engine.

Advantages to repowering with an emissions-compliant engine:

• Enjoy the benefits of a significantly more fuel-efficient system.
• Advances in performance and efficiency from the latest common rail technology provide a cleaner, smoother, quieter, and more powerful engine experience.
• See YANMAR engine data and real time diagnostic troubleshooting codes at a glance with advanced electronic controls and displays that come standard, or as an option, with all current YANMAR compliant engines.

Why Choose YANMAR?

YANMAR  marine engines set the global standard in performance, efficiency, and endurance.

YANMAR’s  reliable engines are well known to have a low total cost of ownership.

YANMAR  has the largest sales and service network in the marine industry, covering over 130 countries worldwide.

YANMAR  is the only manufacturer to bring the benefits of common rail technology to smaller vessels, providing 5x Best in Class standards – Clean, Interconnective, Quiet, Powerful, & Fuel Efficient.

YANMAR  is the inventor of the modern diesel engine and is continuing to innovate solutions that push the boundaries of marine propulsion into the next century. Meeting the demands of the evolving, modern consumer by providing advanced and sustainable technologies is proudly at the forefront of development at YANMAR Marine International.

Ready to Get Started?

Find your local authorized YANMAR distributor or service center here.

YANMAR Repower Guide

Download our guide to repowering, which includes a useful checklist of what to plan for when approaching a repowering project

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Certified YANMAR dealer Motonáutica Balear, Mallorca, completes the installation of two YANMAR 6LF530 diesel engines on Magnum Marine 40 motorboat Adriana to raise performance to a new level.

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The Complete Guide to Repowering Your Boat

Quick Navigation:

What does repowering a boat mean, should i repower my boat, boat repower options and considerations, how to prep a boat to repower, how to repower a boat outboard, how long does it take to repower a boat, how often should i repower a boat, is it better to repower a boat or buy new.

If you're tempted to buy a new boat because you're interested in an upgrade, you're not alone. While new boats are exciting and fresh, they're expensive, and you may not have the budget for one at the moment. If your boat could use some updates and you want to avoid buying new, consider repowering. This approach can be a more cost-efficient way to keep your current boat yet add the necessary updates to keep it running smoothly.

Whether you're repowering a pontoon boat or a fishing boat, you'll want to read a bit about repowering before you proceed. Use our guide for help thinking about the various aspects of repowering your boat and whether it's the right choice for you.

In short, repowering a boat means updating the engine and its subsequent features — you can either purchase a new engine or rebuild your current one. While the engine is certainly a large part of the process, the engine is usually connected to other features on your boat, like steering controls, gauges, fuel and battery systems and more. As a result, almost every function of your boat will feel upgraded.

The type of engine your boat has will partly determine how complex of a project you're taking on. If you're looking to repower a boat's outboard engine, the process will likely be quite simple because the engine is easy to access. If you want to repower an inboard boat, the engine is more difficult to access and is more likely to be connected to other parts of the boat, so the process becomes more complex.

If you're mechanically inclined, you may be able to do the repower yourself, though it's usually best to let professionals repower boat engines. With the proper tools and training, service professionals can ensure your boat gets repowered with less risk of damage.

While repowering older boats can end up being an in-depth project, it's a smart way to improve numerous functions and controls to keep your boat running longer for less money.

There are many reasons you might consider repowering your boat. If you need boating reasons to repower, consider how updating your engine can breathe new life into your boat. Doing so can make taking your boat out on the water a whole new experience, all without having to pay for an entirely new boat.

For many boat owners with aging boats, the body of the boat is still in good condition, but the engine may be racking up a substantial number of hours. When that happens, the engine is likely reaching the end of its life and is running inefficiently. A weak engine can cause the entire boat to run poorly.

When there's nothing wrong with the boat itself but the engine needs a reboot, it often makes sense to repower your boat rather than buy a new boat. If you're looking for more horsepower or better fuel efficiency, you should also consider how repowering can be more financially beneficial than buying new. 

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Repowering your boat is an opportunity to make necessary changes, though not every change will be beneficial to the way your boat runs. Repowering a boat is more than just installing a new engine — there are numerous aspects and different options for each aspect that you should consider.

Here are some important considerations when choosing to repower your boat:

1. Horsepower

Many people want to upgrade their boat's horsepower when repowering. However, you should be cautious if this is something you're considering.

Boats have horsepower capacities, and exceeding them can cause serious damage to the entire boat. Be sure to check what your boat's maximum horsepower rating is before you proceed with a repower. The set horsepower is the horsepower you should keep in mind when repowering, regardless of what you had previously.

Your boat will perform best at its maximum horsepower rating because the engine won't be struggling. This aspect often also results in better fuel economy, too.

2. Engine Brands

The most significant part of repowering your boat is replacing the engine, so naturally, you may want to consider other brands than your current one. You'll likely want to find the best motor to repower older boats so you know it'll work well. Changing the engine brand can mean more work to complete the project, but if you're unhappy with the brand's performance, warranty or another aspect of the brand, it may make sense to switch brands.

Switching brands typically requires the boat to be re-rigged, which will require more of a financial investment on your part. However, re-rigging your boat with a different brand engine is an opportunity to replace outdated controls, which is something you may need to do anyway.

While it's not as common now, boat owners used to switch from gas to diesel because it was cheaper. If you're thinking about how to repower a boat to a diesel engine, it may be best to avoid doing so. Today, diesel engines aren't as cost-efficient.

Additionally, repowering to a diesel engine is quite a challenging task. Repowering to a diesel engine typically requires your entire boat's system to be reengineered, which means the cost might not make it a viable option. If you're wanting to go diesel, consider finding a new or used diesel boat for sale instead of trying to repower your current boat to be diesel.

3. Number of Outboards

If your boat uses an outboard engine, you may consider changing the number of outboards you use. This is another aspect of re-powering you should approach with caution.

If your boat currently uses two outboards, you may be able to switch to one large outboard rather than two smaller ones. When changing the number of outboards on your boat, it's important to consider the weight of the motors and the space two of them take up. You should look for a new outboard that offers similar or more power at a similar weight.

Switching from one outboard to two may not make as much sense, especially because many single outboards today can power your boat just as well or better than two do. Additionally, trying to put two outboards where there was only one can raise several issues. For example, two outboards may add too much weight to the boat, there may not be enough room or your boat may lack the necessary structural support.

4. Controls and Instruments

Repowering your boat is a great opportunity to get everything updated, especially the controls. Like we mentioned earlier, switching engine brands may require you to change your boat's controls, but doing so anyway can improve your boat's performance and your experience.

From the throttle and steering to the electrical harnesses and cables, updating your system will make your new engine more enjoyable. Also consider how digital instruments can provide more information than old gauges, like fuel consumption and efficiency.

5. Joysticks

If you're repowering a bass boat or other fishing boat, you might consider adding a joystick control. Joysticks enable you to maneuver your boat at slow speeds with more accuracy. This can be extremely beneficial when docking or making slight changes in direction while fishing.

However, there are a couple of important factors to consider before adding a joystick. For example, when adding to an existing engine system, joystick systems work better with two outboards rather than a single engine. Additionally, installing a joystick system can be costly, so you'll need to determine if you can afford it and whether it's worth the investment.

6. Fuel System Components

Installing new fuel system components is highly recommended when repowering an old boat. Replacing your fuel hoses ensures your boat has ethanol-resistant, Coast Guard-approved hoses. Checking fuel components regularly and replacing them as necessary is crucial to maintaining your boat's engine.

Additionally, be sure to install properly sized hoses and fittings if you upgraded the horsepower. Components that are too small can prevent fuel from getting to the engine, hindering performance and damaging it.

7. Battery Systems

Depending on the engine and features you want to add, your current battery system may not be capable of powering the entire system. For example, outboards with power steering may require more power than your old battery can handle. In some cases, you may be able to replace old battery cables that may be corroded. Doing so has the potential to improve the battery system.

While doing a repower yourself can be challenging, if it's an outboard, it may be relatively simple. Boats like pontoons and many fishing boats use outboards, so if you have an outboard, you could do it yourself as long as you have the proper tools and knowledge. Consider the following process to learn how to repower a pontoon boat with an outboard engine.

Remove the Engine

Preparing your boat for a repower requires removing your current engine. If you have any hesitations about being able to properly remove your engine, it's best to consult a mechanic to help you out. This way, you won't inadvertently cause damage to the engine throughout the process.

To start, you'll need to prepare the old engine and various cables and wiring. There can be a lot of value in these parts, so if you're planning on selling them, be sure to keep them in good condition and neatly organized. Potential buyers and parts-seekers will look for individual items and entire cable systems, so even if something doesn't work, keep the parts because someone may see value in them.

First, the control, battery and steering cables should be disconnected. If you're reusing the steering and battery cables, be sure to set them aside so they don't get mixed in with the for-sale items. Next, carefully take out the controls, gauges and wiring harnesses. To make installing new harnesses easier during the repower, tie pull-cords to the ends of the wiring harnesses.

To finish prepping the engine for removal, drain all of the engine fluids. Drain the oil and remove the oil filter. Remove any other fuel filters and remember to drain the fuel lines.

Prepare a Gantry

Another important aspect of preparation is preparing a gantry. Since most engines can easily weigh up to 500 pounds, you'll likely need a system for lifting the engine off the boat's transom.

A gantry is essentially a support frame you can use as a crane to lift the engine. If you have a tree with a thick overhanging branch you can park your boat trailer under, this will make a great gantry. Your other option is to build a gantry with four legs, cross-braces and a traverse beam.

Stability and strength are crucial here to ensure the gantry can support the weight of your engine. Once you have a gantry ready, you'll want to tow your trailer into position so the outboard is centered underneath the branch or beam.

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With your outboard in place, it's time to remove it. For this process, you'll need a come-along strap. One end of the come-along will attach to the branch or beam and the other end will hook onto the outboard's lifting eye.

The location of your outboard's lifting eye will depend on its brand. You may find it mounted under the cowl, while others may lack one entirely. In this case, you'll need to purchase a lifting eye and screw it into the top of the engine.

With your come-along attached to the lifting eye, you'll want to ratchet the strap so there's minimal tension. With the strap tight enough to support the engine when it's loose from the boat, you can begin unscrewing the nuts on the engine mount. With the nuts removed, you can get the bolts out.

With a partner, slowly move the boat forward just a bit while the other person gently rocks the engine to loosen the bolts. It's crucial to do this step carefully and slowly to prevent the mounting holes on the transom from getting damaged. Damaged mounting holes will make it difficult to install a new outboard securely.

Once the bolts are removed, pull the boat away and your old engine will remain hanging from the gantry. To get the old engine out of the way, simply use the ratchet to lower it onto a truck bed or trailer to haul it away.

The process for mounting a new outboard will be similar, although performed backward. If you're installing an outboard with compatible controls to your current setup, the installation will be as simple as securing the engine on the transom and rewiring the controls. If you need to update your old controls, gauges and instruments, you may need to seek help from a repower dealer as these processes become significantly more complex.

The amount of time it takes to repower a boat will largely depend on the complexity of the upgrade, the type of engine and whether you're doing it yourself or having a dealer handle it. For example, an outboard repower could take as little as an afternoon, but repowering a boat with electric features and new systems will take more time.

If you have a dealership service do the repower, the time it takes will vary depending on their availability and readily they can get the necessary parts.

If you've bought a used boat, you'll likely need to repower it sooner rather than later because the motor will likely already have several hours on it. If the engine is well-maintained, you may be able to put up to 5,000 hours on it before repowering it.

However, most boat owners need to repower after 2,000 hours . While this may make it sound like you'll need to repower your boat often, for most boat owners who only use their boats seasonally, this could end up being 10 or more years.

The best way to know how often to repower your boat is to keep an eye on the hours you put on it and how it continues to run over time. If you notice it starting to run poorly, you may be looking at a repower sooner than that. Keep an eye on it and you'll know the best time to repower your boat.

In many cases, repowering is a more cost-efficient option for boat owners looking to upgrade. If your boat is still structurally sound but could use some more power, repowering may be a viable option. Luckily, there are financing options available whether you want to buy an engine to repower your current boat or decide to get a new boat altogether. If you're unsure of the best option for your wallet and your boat, consider having a service dealer give you a price estimate based on the type of boat and its condition.

Compare prices — if the cost of repowering is close to or exceeds the cost of buying a new boat, it probably won't end up being the right option. At that point, buying a new boat will be more reliable and may even have newer features you wouldn't be able to get installed on your old boat.

Learn About Boat Loans From My Financing USA

Whether you're repowering your current boat or looking to invest in a new one, you're likely looking for financing options. At My Financing USA, we can help you finance engines or a new boat entirely. We do the leg work for you when it comes to finding the best boat financing programs across the nation. We'll help you get pre-qualified and will only send you to one lender at a time so you can protect your credit in the process. 

With an entirely online process, you can sign documents electronically and receive funds fast. With our help, you could get your financing within two to three days and start your repowering project sooner or buy the new boat you've been admiring. Our application process is simple, and you can fill out an application in minutes to get started.

Would you like more information? Contact our friendly team today!

Additional Resources on Boats:

• Boat Winterization Guide
• How to De-Winterize Your Boat
• Boat Maintenance: Everything You Need to Know
• Guide to Different Types of Boats
• How to Rent a Boat Slip

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Catalina 30 -repower options

• Thread starter Don
• Start date Jun 29, 2001
• Catalina Owner Forums
• Ask A Catalina Owner

My Universal 5411 is dead - I need to repower my 1983 Catalina 30. I am looking for options. I have been told that a new engine installed is around 11K. Does this sound about right? I hate to spend that much on an older baot. Has anyone ever repowered a 30 with one of those new 4-stroke outboards? I was thinking it may be a bit funky, but alot less expensive. I know- it would screw up my resale, but I anot really concerned about that at this point. Any ideas?Thanks  

How about the A-4? About half the price, and very dependable!Best Regards, Rob  

John A. Visser

What do you mean by "dead?" I imagine that unless the block and head are cracked, you could get your motor rebuilt, or exchange for a remanufactured motor, for much less than the outright purchase of a new one. And, if my memory serves, you can buy a new twin cylinder diesel of about 12 HP for less than half of $11k, perhaps less than $4k (5411 is twin of 11 HP). I would discourage strongly going to a gas motor like the A4 for a couple of reasons:1. gas is inherently more dangerous than fuel oil.2. you already have the diesel fuel tank and plumbing and filter system.3. all other things being equal, the boat with the gas engine is worth less than the boat with the diesel.For such a small engine, I recommend a reman witha core swap and swap it yourself.jv  

Oh man.. Not this discussion again.... John, I have to disagree with you about A-4's. They are not dangerous, as their numbers and service histories will tell you. Easily serviced and properly maintained - they will last quite a while. While gasoline is more flammable than diesel, it is not necessarily more dangerous.Bottom line: my 1979 A-4 still runs like a top, and I don't need to replace it, do I? The fact that the diesel needs to be replaced and the gas engine doesn't speaks volumes.Best Regards, Rob  

Jeff Walker

My neighbor uses an outboard His Yanmar finally died in his Cat 30 and he put a 15 horse Honda 4 stroke mounted on a bracket. He made a couple of mistakes. The engine should have been a long shaft because the engine comes out of the water and races in any kind of rough seas. The positive side is his boat sure is quiet now and the engine does a good job moving the boat in calm water. Also consider that the new 4 strokes are much heavier than their 2 stroke counterparts and the bracket must be made adjustable with a block and tackle or some other mechanical system.I would look for a used, re-built inboard if it was me but I can see how an outboard would work.Good luck,Jeff  

To Rob RIch - It's the FUEL,, ... Rob,Please re-read my response. I was careful in stating it was the fuel that was dangerous, no thte A4. Your comment "While gasoline is more flammable than diesel, it is not necessarily more dangerous" is utter nonsense. Check the Coast Gaurd regulaitons regarding gas v. diesel installations. Your further comments:"Bottom line: my 1979 A-4 still runs like a top, and I don't need to replace it, do I? The fact that the diesel needs to be replaced and the gas engine doesn't speaks volumes"are also nonsense, in that they are anecdotal.Please read carefully and get it straight before refuting someone else's reply, at least out of courtesy.  

Mr Visser, please read more carefully.... Mr. Visser, I seem to have offended you. If so, that was not my intention. However, before hit the poison pen too hard, I suggest you re-read my post. It was written in a light tone - not a viscious one.My post reads verbatim:"While gasoline is more flammable than diesel, it is not necessarily more dangerous."What this means is that with proper handling, gasoline should be no more dangerous than diesel. Proper use of the blower (run 3 to 5 minutes), proper inspection of the fuel system on a regular basis (good PM), and general use of the old sniffer will see you safely to your next port.As for anecdotal evidence, yes, it was... and intended to be so. Holding a masters in journalism has taught me not to communicate erroneous facts or statistics. All I said is that it "speaks volumes." And it does, especially when it comes to conventional wisdom, which at best is not all that conventional when you think about it. So, I hope you understand my angle and my post. I may not agree with what you say, but I will always defend your right to say it, and post a response to my response. That is why this website is here, and I wouldn't want it any other way.Best Regards, Rob Rich  

John Visser

Bottom line Regardless of the arguement, my choice for inboard auxiliary power is diesel, for reasons of safety related to the fuel.jv  

Larry Watkins

C-30 repower Don; Don't stick an outboard on your transom, you'll look like an ignorant goof and other sailors will laugh at you behind your back. It's almost as bad as leaving your fenders down. Bite the bullet and rebuild your 5411. If you do the labor yourself, the cost will be reasonable and you'll have the engine the boat was designed to use.  

Larry is right...I saw a Newport 28 with a .... longshaft outboard and sailed over to investigate. The diesel had locked up and the owner added the 15hp outboard and hates it. Even in our relatively protected inland Florida waters, the outboard comes out of the water on all but the calmest days. He said it was a stupid idea and a total waste of money and effort and has killed the value of the boat. Maybe you can rebuild the 5411. Good Luck  

Henry Weber

diesel rebuild DonAbout six months ago I rebuilt my Yanmar 12hp diesel. It was a fair amount of work but not too bad. This was a single cylinder. It cost about $900 which includes all parts from Yanmar, machining done in an engine shop, and removal/install. Labor was mine and is not included. (Replaced valves,seats,cylinder sleeve, piston, rings, all bearings, rod, oil pump. Crank and block and camshaft were ok.)Has been running like a new engine ever since. I have about 100hrs on her since rebuild.Good luckHenry  

Jay Rickles

re engine Don't know about an outboard option, but I had to put a new engine in my 1989 Catalina 30. I had a Universal 23hp and the replacement was a Universal 27hp. I had to redo some of the exhaust fitings to the water lock as the engine as been redesigned as is usually the case on the older boats. I also added an extra alarm and warning light at the helm for the oil pressure and water temp. This engine cost me $5800 plus about an extra $1000 for parts to make it fit. I looked at a Yanmar, but it would have run $6800 for the engine and $2000 for the part to make the Yanmar fit. With all charges (pulling and checking on rebuilding the old engine) it came to about $11,000 as you have found. A lot of the labor comes from having to re-install and wire up the new engine..all the connections are different from the plug in your boat and it has to be wired up separately. I would be interested in what you find regarding an outboard, but you might want to check on what happens to your resale value if you do this...also, what do you do with the old engine. Good luck and happy sailing.  

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All our real and recent boat repowers (WATCH). Plus: Repower options, the boat repower calculator, what repowering a boat means and how to calculate your engine replacement cost

15 June 2019

What does it mean to repower your boat? Well, it’s basically putting new engines on, usually with more power and smarter tech. Fitting new outboards is one of the fastest, easiest and most cost-effective ways to give your boat more speed, performance, power and lower fuel costs. And there are loads of awesome options when it comes to a boat repower.

A repower is as easy as taking a look at the available outboards and then speaking to our sales guys and technicians in our Suzuki workshop , deciding on the repower option that’s best for your boat and your budget, and then booking your slot to have the new motors fitted. They’re brand new, fully tested, fitted and certified, plus you get a new warranty on the new outboards too.

Repowering your boats is probably one of the most satisfying ways to increase power on your boat without breaking the bank. See what the owners of these recently repowered boats have to say:

NEW BOAT REPOWERS

Jubal repower: upgrade to twin suzuki df100s.

More responsive, fuel savvy and a smoother ride. WATCH here:

New Suzuki DF100s on Ace Cat 555 Super stable steering. Lightest in its class. And so much more oomph. Check out the twin DF100s we fitted to Charles Wright's 5.5m Ace Cat. Now you're gonna do a lot of lekker deeper fishing, Charles and family! We'll show you more on this project soon. #GetNautiIn the meantime, discover the Suzuki DF100 here: https://nautitechsuzuki.com/outboards/df100b/ Posted by Nauti-Tech Suzuki on Monday, 2 September 2019

“You have to love the performance on these Suzuki four strokes, they’ve just got a bit more grunt in them. We took Jubal with the new motors out for the first time last Saturday and, boy, do they run well. I had to keep playing on that edge between too much and just having fun out on the water,” says Charles Wright, owner of the recently repowered Jubal .

5.5-Metre Ace Cat | Prev: 90hp 2 strokes | Repowered: 2 x New Suzuki DF100

ZEE KOETS REPOWER: UPGRADE TO TWO SUZUKI DF80S

Better performance for less fuel, more torque and superior after-sales service that seals the deal. WATCH:

Repower: DF80s on a 5-metre powered cat Instant acceleration and a finely tuned gear ratio. Doing a PDI on two new Suzuki DF80s on a 5.7-metre powered cat that loves going after tuna. Get the full sotry on the repower here: https://nautitechsuzuki.com/zee-koets/ #GetNauti Posted by Nauti-Tech Suzuki on Thursday, 6 June 2019

“I had two Suzuki 70s on before, and of course they were great motors, but you can feel the difference with the new Suzuki DF80s . I can now run at 1000rpm and get to the same speed I’d normally have to up to higher revs for. It definitely uses less fuel now, and the power configuration is just ideal for my boat,” says Emile Coetzee, owner of newly repowered Zee Koets .

UKWABELANA REPOWER: UPGRADE TO TWO SUZUKI DF325S

More power, less fuel and greatly improved functionality on this incredibly hard-working 13-metre marine research vessel. WATCH:

The best things come in twos. Dual louvre, dual prop, dual injection and the efficiency of a 300hp packed into the power of a 325. Check out the two DF325s we fitted to a 13-metre powered cat research vessel for the South African Institute for Aquatic Biodiversity, Makhanda, Eastern Cape recently. Read all about it here: https://nautitechsuzuki.com/ukwabelana/. Plus: More on the Suzuki DF325 here: https://nautitechsuzuki.com/outboards/df325a/ #GetNauti Posted by Nauti-Tech Suzuki on Thursday, 23 May 2019

“The new outboards are just awesome, the boat’s got more life now, so much more oomph. We used to have 300hp motors on, and getting the new Suzuki DF325s , well, that’s definitely a step up. It’s like the boat’s just come to life. That dual prop and better systems just mean she has more power now,” says Koos Smith, skipper of the newly repowered uKwabelana .

13-Metre Powered Cat | Prev: 300hp outboards | Repower: 2 x New Suzuki DF325

ABOUT BOAT REPOWERS

What are my repower options.

Well, you can start by checking out the available outboards . And then it’s always good to chat with sales guys and technicians because you want to be sure that you select the right outboards for your repower. You want to take your boat’s size and max engine weight into consideration, to be sure you select the right option. And then also ensure the steering and all systems are compatible. For the best advice, contact Nauti-Tech Suzuki here .

OUTBOARD REPOWER CALCULATOR

To get a general idea of how much power you need for your boat repower, you can use your boat’s weight as a guide. Convert your boat’s weigh into pounds, so a 2.2-ton boat becomes a 5000 pound. Normally, for a fairly average performing boat, you need about one horsepower (hp) minimum for every 25–40 pounds of weight (the range is wide because of all the different types and brands of boats you get).

If you take 5000 and divide it by 200, you get 25 pounds per horsepower. And, 5000 divided by 125 is 40. So you can get away with 125hp–200hp on that boat. But the lower that number is, the better your boat will perform. Try dividing 5000 by 300 and you’ll get 16.6, which is starting to become nice and fast. Divide it by 400 and you’re building a boat you’re gonna love.

Now, if you’re fitting two engines, remember that you’ll divide that horsepower by two. So, our super 400hp becomes two 200hp outboards. And then it becomes important to keep each individual outboard’s weight in mind. The two outboards together shouldn’t weigh more than your boat manufacturer’s max spec for your boat, so you’ll have to play with different configurations until you find the one that gives you the best power-to-weight ratio and works for your pocket. Fortunately, the technicians in our workshop will help you determine your best options.

Get the inside track on how to choose an outboard for your boat .

CALCULATING BOAT ENGINE REPLACEMENT COST

With outboard motors, it’s fairly simple. Your costs are the price of the new outboard(s), plus labour, fitment and testing. Now, it’s important to take into account the systems and steering, because those need to be compatible, otherwise, they’ll need to be replaced, which can add to the costs.

WHAT’S THE BEST OUTBOARD ON THE MARKET?

Now, we’re not going to tell you Suzuki is the best. Make up your mind for yourself: Suzuki is the most awarded outboards manufacturer in the world, having won 8 National Marine Manufacturers Awards (NMMA) for Innovation since 2003, plus two more awards in the 1990s. Check out the list of Suzuki awards .

Suzuki is currently the best-selling outboard in South Africa. Perhaps because we offer great value for money, excellent after-sales service, advanced tech like Suzuki Lean Burn that boosts your boat fuel economy and performance, and every Suzuki outboard also doubles as a trolling motor .

But, when it comes to repowering your boat, it’s all about what really works for you.

NEED A BOAT REPOWER?

Check out our Suzuki outboards and enquire about boat repowers .

Did you know we also do complete boat refurbs? Check out the before and after on Line-Breaker . And y ou can also browse pre-owned boats, outboards and accessories among our used boats .

Discover 7 BoatPro reasons to  start boating .

And, it’s official: See why Suzuki is the No 1 Best-Selling Outboard .

PLUS: CHECK OUT THIS NEW LAUNCH

We’ve just launched Jan Hendrik Hattingh’s new CarryCat 900, the  Carry On 2 .

Plus: What happens when you fit two 140s on a 6.7-metre boat specced for max 115? Find out with recently launched brand-new boat Seadation .

Also check out Robin Vermaak’s all-new CarryCat 760 game fisher,  Piromero .

Plus: See all our custom-built  new boats  and all our favourite new launches under our full collective post on our  boats .

THE PURSUIT OF AWESOME

Legend also has it that CarryCats and every other boat runs better under Suzuki power. Discover it for yourself among these  Suzuki outboards .

BUILT FOR FISHING

Legend has it that it’s more fun fishing in a CarryCat. So tell your friends who might not know yet to check out the little-big  CarryCat 670 , the next-level  CarryCat 740  and the all-round great fisher  CarryCat 760 .

Discover more specs, options and configurations for bass boats, riverboats and ski boats under our section on  new boats .

BE THE FIRST TO KNOW

To ensure you always get first dibs on the latest deals and be the first to know about new, events and special offers by joining the  Nauti-Tech Suzuki Facebook community  and  signing up for our newsletter .

— Need to refurbish, refit and revive your boat? Take a peek inside our award-winning  Suzuki Marine workshop .

READY TO #GETNAUTI?

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Outdated To Updated Part 4: Bass Boat Repower

The fourth installment of turning an older boat into a fully modern fishing rig. in this piece we demonstrate some of the key steps to repowering a bass boat with modern battery power..

Part 4 of Outdated to Updated will show the process of repowering the boat.

Catch up on the series:

Part 1: Bass Boat Breakdown

Part 2: Bass Boat Interior Repairs

Part 3: Minn Kota Raptor Install

Welcome to Part 4 of Outdated to Updated, I’ll walk you through my process of repowering the main power plant of the rig by installing X2 Batteries , and some of the important lessons I learned along the way. One of the tools I’d highly suggest for this step, and upcoming steps is a 10-ton Hydraulic Wire Battery Cable Lug/Terminal Crimper . I’ll give credit where credit is due, my buddy and regular In-Fisherman contributor Ross Robertson turned me onto this idea, and it’s made this entire project much easier. Get one. They’re not expensive at all.

This is the old battery that powered most of the boat accessories and the previous electronics. It was way underpowered, and it a huge mess. This looks intimidating—and it made me grumpy, but just start figuring it out one wire at a time.

The goal was to replace the three lead-acid batteries that made up the 36-volt system to run the Minn Kota Ultrex with three 12-volt X2 lithium batteries. That would reduce a tremendous amount of weight, but also a battery reconfiguration would allow for more room. I also planned to replace the main crank battery with one or two 31-series X2 AGM batteries. The AGMs are heavy, but one instead of four was a vast improvement. I ended up only placing one of the AGMs in the rig.

As I went through all the cables attached to the old battery, I thoroughly labeled them so I knew exactly what went where. A roll of white electrical tape and a black Sharpie made this job easy. This portion of the process was intimidating, but at the end of it, I realized it wasn’t that bad at all. You’ll be glad you did it.

I’ll admit, this photo still makes it look clustered, but I also know how much more organized this is. The connections are clearly labeled and the number of connections was greatly minimized. I am not connecting any of my electronics to this battery, more on that later. In the meantime, notice the buss bar in the top right? I installed that a while ago and elected to keep it in play. I hooked up lights and livewell to it. A slight bit of rust showed up over the last two years, so I’ll keep that in mind if either the lights or livewell start acting up.

Video That May Interest You

The existing master power switch got pretty rusty, and I later found out that was because it was cheap, and it was cheap. So I upgraded to a Blue Sea 6006 single circuit switch . It’s heavy duty, and again Ross Robertson said it’s the best one to use. I believe him, he’s a boat-rigging wizard. I put the tape measure here so you can see the overall footprint.

Here’s another look at the switch before it gets fully installed.

Here’s a look at the old switch (back right) next to the new one. It’s certainly a better switch in feel alone.

Recommended

It's much easier to find without looking, it's sturdy and fits snuggly right where it needs to be. This was a solid upgrade.

The 10-ton Hydraulic Wire Battery Cable Lug/Terminal Crimper was a game-changer for this project It’s worth every penny. You’ll need this tool to adequately place lugs on the end of heavy wires like the 4- and 6-gauge. You just can’t attach lugs to wires that big by hand—I tried. This tool is worth it.

This kit of wire lugs and matching heat-shrink tubes cost less than $25, the second one less than $15. Cheap and useful even after this project is done.

Make sure you put the heat shrink on before you attach the lug, or you may have wasted a good lug. The heat shrink is a critical component to fully waterproofing this system. It’s quick and easy.

A heat gun is a lifesaver and evenly heats the tubing without burning your fingers. Another inexpensive tool you’ll use over and over again, available at Home Depot, or the like.

Here’s the finished product. Almost looks professional. Now we’re ready to finish the jumper wires for the 36-volt system for the trolling motor.

Here are the finished wires. You can often buy them at a hardware or auto parts store, but the overall cost is cheaper to make them yourself. Plus, it’s more satisfying.

Here is the compartment that will house two of three trolling motor batteries. I tried every configuration possible, but I could only fit two batteries in here. The boat was originally built to hold a 24-volt trolling motor, so this is what I had to work with. This is also why I needed to custom bulid battery jumper cables so they’d reach specific distances.

Here are two of the three X2 Lithium batteries installed.

Here’s the third battery position. As mentioned in a previous installment, this compartment was originally meant for spare prop storage. I had to split this space with the third trolling motor battery and the two Minn Kota Raptor hydraulic pumps.

Here is the view of all three X2 lithium batteries installed. Very clean.

While installing the batteries, it was paramount to make the most of that available space and with corelating projects, I worked on placing the Raptor hoses. They need to be coiled up and tied together to fit neatly in the battery compartment. It got tight, but it worked.

This is a unique set-up for my boat. As I’ve said several times, space is extremely limited in the power-plant area, so I pulled a trick taught to me by my buddy Gerald Swindle and attached the 4-bank Minn Kota Precision charger under the rear hatch. It’s worth mentioning that my charger is an earlier generation that happens to be a different configuration than the new ones, and it fits perfectly in my boat. If I were to upgrade the charger, I’d likely have to find a different spot for it. Right now, it’s perfect. Oh, and this charger is indeed built to charge and maintain lithium batteries. Also note the different colors of electrical tape. I used that method to match up charger ends, and so if the charger is indicating a bad battery or one of them not taking a charge, I know exactly which one it is. The colored tape helps the troubleshooting process, and improves organization tremendously.

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