Meet the Yamaha XTO 400hp V8—5.6 L DOHC powerplant delivering class‑leading 400hp and 298 kW. Featuring full direct-injection, steer-by-wire, and breakthrough reverse thrust with Helm Master® EX integration. Precision-engineered for peak power, control, and efficiency.
XTO 400HP V8
Built to Rule Tides
The Yamaha XTO 400hp V8 redefines propulsion in a form that’s both muscular and refined. With a 5.6-litre, 32-valve DOHC V8 at its core, the engine delivers 400hp at 6,000 rpm. But raw numbers tell only part of the story. Direct Injection ensures efficient combustion across the rev range, while the unique reverse exhaust boosts control by tripling reverse thrust output. In tight marinas or wide-open stretches, every turn becomes instinctive.
TotalTilt™ tilting, dual-chamber oil systems, and integrated electric steering eliminate the old bulk and complexity. The engine’s massive gearcase, custom-built crankshaft, and quad-thermostat cooling system ensure resilience under heavy demand. With its onboard high-output charging system, the XTO doesn’t just move your vessel—it powers your full marine experience, from navigation to sound systems. This is premium marine propulsion—not reimagined, but perfected.
DETAILS
ABOUT XTO 400HP V8
ENGINE
| ➢ CATEGORY | Premium Marine Engines (450 – 225hp) |
|---|---|
| ➢ ENGINE TYPE | 4-stroke, DOHC, V8 |
| ➢ Displacement | 5,559cc |
| ➢ No. of cylinders / Configuration | V8 |
| ➢ Bore x stroke | 96.0 x 96.0 |
| ➢ Prop shaft output at mid range | 400hp @ 6,000 RPM |
| ➢ Full Throttle Operating Range | 5,000 – 6,000 RPM |
| ➢ Lubrication system | Wet sump |
| ➢ Fuel Induction System | Direct Injection |
| ➢ Ignition / advance system |
Electronic ignition (TCI) |
| ➢ Starter system | Electronic ignition (TCI) |
| ➢ Gear ratio | 25/14 1.79 |
DIMENSIONS
| ➢ Oil pan capacity | 7.8 L |
|---|---|
| ➢ Weight without propeller | 437 kg – 458 kg |
FEATURES
| ➢ STORAGE CAPACITY | 168.3 L |
|---|---|
| ➢ RIDER CAPACITY | 1-3 People |
PHOTOS
GALLERY
SERENITY
Feel the Helm Answer
Sleek below the waterline, sculpted above. Every angle of the XTO 400HP V8 reflects not only hydrodynamics, but intention. With premium 3D graphics and industrial-grade underpinnings, this engine blurs the line between luxury and raw function. The design isn’t about looks—it’s about legacy.
DESIGN
ENGINE
The XTO V8 breathes through 5.6 litres of naturally aspirated force, summoning 400hp with grace and discipline. Its 96 mm bore and stroke give it perfect combustion symmetry, while DOHC and VCT tech manage air flow with surgical precision. On throttle, it’s not a surge—it’s a fluent release of ocean-shaping authority.
WARRANTY
5 YEAR PROMISE
Enjoy Yamaha’s industry-leading limited warranty, offering up to 5 years of peace of mind. The XTO 400HP V8 is built to exacting standards with proven dependability. Whether you’re navigating calm bays or deep offshore waters, Yamaha’s legacy of excellence keeps you covered.
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