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2024 Yamaha 252SD

• By Boating Tech Team
• December 8, 2023

Yamaha’s 252SD sports classic bowrider appeal, an abundance of features and clever innovation, but the 2024 headlines are topped by the introduction of a new engine duo. Yamaha’s naturally aspirated 1.9-liter High Output powerplant offers the largest displacement yet seen in the jet-drive market. Combined, the pair produces 400 hp, pushes the 252SD to 30 mph in 7 seconds, and tops out near 48 mph. That the engines provide this power without the use of superchargers is notable, which will pay off on the showroom floor and at the gas pump. And the low-speed handling might steal the show. Yamaha’s Drive system adds paddle-style shifters on each side of the steering wheel to offer an alternative for shifting in and out of forward, neutral and reverse. It’s great in tight confines, keeping a driver’s hands on the wheel and attention on the water. Drive X, an exclusive addition to the 252SD, integrates directional control buttons into the steering-wheel hub. Similar to a joystick, Drive X allows drivers to crab the boat sideways, spin it within its own length, or even hold the boat against a dock when boarding passengers or gear. 

Maximizing cockpit space is a ­Yamaha trademark. The 252SD boasts a ­12-passenger capacity and offers several unique twists on the standard bowrider formula. The bow cockpit offers twin benches but adds filler cushions, and you can fashion a sun pad or third forward-facing seat ahead of the ­cockpit walk-through. Front cushions allow passengers to stretch out; when removed, sit facing forward with feet on the floor. Aft, convertible stern seatbacks slide forward or aft to enhance comfort or shift focus to the swim platform when coving.

Clever touches include storage behind the angled aft seatbacks, a flip-up galley table, storage, and a designated cooler spot just abaft the helm seat. The water-focused transom area also adds padded backrests for those sitting atop the swim platform, as well as removable swim-up seats that mount below the water’s surface. They make the swim platform a waterside bar top and provide access to remote sound-system controls.

High Points

• Connext 12.3-inch touchscreen offers intuitive control of boat systems.
• Spacious port console can be used as a head compartment, changing room or storage.
• Extensive standards list will keep costumers happy.

How We Tested

• Engines: Twin 1.9-liter Yamaha High Output marine engines
• Drive/Impeller: Jet drive/155 mm diameter pump with stainless-steel impeller
• Fuel Load: 48 gal. Crew Weight: 305 lb.

Pricing and Specs

Yamaha Jet Boat Manufacturing  – Kennesaw, Georgia;  yamahaboats.com

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Yamaha's Got a New 7600-RPM, 200-HP Four-Cylinder Engine

We'll take our new engine debuts where we can get them these days. Even if they're in boats.

But the marine industry is a different story, and in recent years some of the coolest new engines— Mercury's V-12 , Honda's V-8 —were designed for boats. Which is also the case for Yamaha's new 1.9-liter four-cylinder, which makes 200 hp at 7600 rpm and can be found powering high-output WaveRunners and jet-drive boats. It's not designed for cars, but the Lemons racers among us can dare to dream.

The 1.9-liter four replaces Yamaha's 180-hp 1.8-liter mill and blurs the performance line between the company's naturally aspirated and supercharged engines. Yamaha's supercharged 1.8-liter makes 255 horsepower, but in a WaveRunner there's not a huge practical difference between the boosted 1.8 in a SVHO model and the naturally aspirated 1.9 that powers HOs. Personal-watercraft manufacturers adhere to an agreement that's something like the old German pact to limit top speeds to 155 mph, except on the water the target is 65 mph. That spec includes a 2-mph fudge factor, which naturally means that PWCs of sufficient horsepower top out at an electronically limited 67 mph. Since a 200-hp WaveRunner can hit that limit, the only difference is how quick you get there.

The 1.9-liter, as a new design, enjoys a bundle of changes aimed at durability and refinement. One example: There's an extra bolt connecting the cam chain housing to the block—a little tweak that makes a big difference. "The cam chain room is a thin aluminum casting," says Mark Sagers, senior watercraft factory service technical specialist (in other words, the guy who knows all the engines inside out). "That great big straight piece of aluminum is like a sound board, amplifying the noise of the cam chain. But if you run a fastener from that to the main casting, it knocks that noise way down. That's important when you're sitting right on top of the engine and it's bolted to a guitar body, basically."

Performance-enhancing upgrades include a new exhaust manifold with dedicated pipes for cylinders one and four, a bore increase from 86 mm to 88 mm, and a channel to route cooling water between the exhaust valves to cool the valve seats. The 1.9 even uses about a half-quart less oil than the 1.8, because Yamaha determined that it could cut windage losses (read: increase horsepower) without sacrificing durability. And durability versus performance is always a tradeoff, whether on land or not. "In a 250-cc motocross bike, the maintenance schedule calls for a new piston every nine hours and it's putting out specific power like a NASCAR engine, or almost Indy," says Sagers. "Boats are more on the lower end of high performance, so we can make them last thousands of hours."

A car engine might well make its horsepower peak beyond 7000 rpm, but it isn't expected to spend much time there. An engine destined for a WaveRunner is a different story. "A lot of the durability testing is done fully loaded at wide open throttle," Sagers says. "These will run a very long time at WOT. Waverunners are often idling or WOT, and there's no middle ground. But I've seen Waverunner engines with more than 1500 hours and no major mechanical work. It's staggering that these mechanical things can live through this."

Still, 200 hp isn't enough for everyone. Logically, it would seem inevitable that this engine will get a supercharger and the 1.8-liter will be retired. Boost prognosticators might find a clue at the 1.9-liter's Coast Guard–mandated intake flame arrester—the intake manifold is cast around it so it can't be sucked into the engine. Which is the kind of thing that would probably only happen if said intake was huffing some major boost. Perhaps soon, it will be.

In the meantime, you can break the 200-hp barrier without forced induction. And for twin-engine boats, that means Yamaha is packing 400 horsepower into some of its 22-footers, which we imagine would mean 50-plus-mph top speeds given that the 210 FSH hit 48.0 mph with the 1.8s and their 360 total horsepower.

Yamaha has built some nice automotive engines—most famously, the Ford Taurus SHO's —but those of us dreaming of 200-hp Yamaha-powered Miatas will probably have to wait a while for these latest ones to hit the salvage yards. (You can spend that interim figuring out how to adapt a closed-loop cooling system, since the jet drive on these engines doubles as a water pump.)

Calling a powerplant a "boat motor" is traditionally a pejorative, meaning a low-revving hunk of iron, an outdated castoff better suited as a mooring. But motors are electric, and that's where things are heading on the highways. So if you appreciate the mechanical complexity and cleverness of engines, boats are the new—and maybe last—frontier.

Ezra Dyer is a Car and Driver senior editor and columnist. He's now based in North Carolina but still remembers how to turn right. He owns a 2009 GEM e4 and once drove 206 mph. Those facts are mutually exclusive.

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2023 Yamaha 255 XD

By: Timmy McNamee

Let’s talk about jet power! With twin 1.8L SVHO, the Yamaha 255XD kicks out a whopping 500 HP with its supercharged engines. The power, performance, and ultimate versatility of the Yamaha 255XD makes this jet boat model one of the most well-rounded in the industry.  

To the consumer looking for convenience in shallow depths, while having a boat that can do it all, the Yamaha 255XD will not disappoint. With ultimate functionality and killer surf waves, watersports on the water just got a whole lot easier and better!  

Specifications

LOA: 24’6 Beam: 102” Capacity: 12 Persons Engine: Twin 1.8L SVHO Intergrated Ballast System: 1,600 lbs Dry Weight: 4,740 lbs MSRP: $123,000 CAD

For more information:   www.yamahaboats.com

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Posted 2024-03-15 12:28

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