Manufacturer
Yamaha XTO 400hp V8
Japanese manufacturer of marine propulsion and boat-control systems, including electric propulsion products.
Official manufacturer website ↗
XTO 400hp V8
When you want the kind of power that makes onlookers spill their iced lattes, you want the XTO 400hp V8. It blends huge torque, cutting-edge control and a not-so-subtle reminder that your boat now outranks everything else at the dock. Including that guy with all the gadgets and the designer loafers that sold out weeks ago.
Key facts
- Family: Premium
- Engine type: 32-Valve, DOHC with VCT, 60 deg. V8
- Displacement: 5559 cm³
- Rated output: 294.2 kW
- Weight: 447 – 468 kg
- Operating range: 5000 – 6000 r/min
- Fuel system: Direct fuel injection
Position in Yamaha range
Yamaha’s Premium family covers the higher-output outboards in the current range. Installation size, steering, electrical capacity and system integration matter as much as rated output.
This is model 2 of 7 in the Premium family when the range is ordered from higher to lower rated output.
Neighbouring models
- Higher-output neighbour: XTO 450hp V8
- Lower-output neighbour: 350hp V6
Before choosing
Verify the boat manufacturer’s permitted power range, transom height and shaft length, engine and rigging weight, steering and control compatibility, electrical load, propeller selection and the exact variant code before ordering. For twin or multiple-engine installations, confirm steering and control-system requirements as a complete package.
FAQ
- Is this the same as another Yamaha model with similar horsepower?
- Not necessarily. Yamaha can offer different families, control systems, shaft lengths, rotations or duty-oriented variants at a similar output. Compare the full specification rather than horsepower alone.
- What should be verified before installation?
- Confirm shaft or mounting configuration, steering and controls, electrical requirements, propeller selection, weight and the exact model or variant code.
Sources & verification
Technical data: Yamaha Motor Europe official product page. Official factsheet. Verified: 2026-09-06.
Engine
| Engine type | 32-Valve, DOHC with VCT, 60 deg. V8 |
|---|---|
| Displacement | 5559 cm³ |
| Bore x stroke | 96.0 × 96.0 mm |
| Compression ratio | 12.3:1 |
| Fuel induction system | Direct fuel injection |
| Lubrication system | Wet sump |
| Engine oil capacity | 7.8 L/ 7.5 L (with / without oil filter replacement) |
| Ignition / advance system | TCI |
| Alternator | 104 A (battery charging: 88 A) |
Dimensions
| Overall length | 1217 mm |
|---|---|
| Overall width | 652 mm |
| Overall height | X: 2059 mm, U: 2186 mm, E: 2313 mm |
| Engine transom height | X: 640 mm, U: 767 mm, E: 894 mm |
| Steering angle | 31 deg. each direction |
| Dry weight | 447 – 468 kg |
Performance
| Maximum propeller shaft output | 294.2 kW |
|---|---|
| Full throttle operating range | 5000 – 6000 r/min |
| Idling speed | 650 – 750 r/min |
Bracket/Drive
| Shallow water drive | PTT: variable position |
|---|---|
| Gear shift | F-N-R |
| Gear ratio | 1.79 (25/14) |
| Gear oil capacity | 1.950 L / 1.830 L |