Manufacturer
Yamaha 350hp V6
Japanese manufacturer of marine propulsion and boat-control systems, including electric propulsion products.
Official manufacturer website ↗
350hp V6
The 350hp V6 is Yamaha's most powerful V6, a glorious overachiever that charges into the gap between the 300hp and XTO with all the energy and drive of someone who drinks neat confidence for breakfast. Massive power, unshakeable handling and sleek, XTO-inspired swagger mean you won't need to tell anyone you've upgraded. They'll hear it. And feel it. And possibly ask you to slow down — which you absolutely won't.
Key facts
- Family: Premium
- Engine type: 24-Valve, DOHC with VCT, 60 deg. V6
- Displacement: 4256 cm³
- Rated output: 257.4 kW
- Weight: 293 – 304 kg
- Operating range: 5000 – 6000 r/min
- Fuel system: 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 3 of 7 in the Premium family when the range is ordered from higher to lower rated output.
Neighbouring models
- Higher-output neighbour: XTO 400hp V8
- Lower-output neighbour: 300hp 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 | 24-Valve, DOHC with VCT, 60 deg. V6 |
|---|---|
| Displacement | 4256 cm³ |
| Bore x stroke | 96.0 × 98.0 mm |
| Compression ratio | 11.0 :1 |
| Fuel induction system | Fuel injection |
| Lubrication system | Wet sump |
| Engine oil capacity | 7.9 L/ 7.6 L (with / without oil filter replacement) |
| Ignition / advance system | TCI |
| Alternator | 74 A (charging capacity: 50A) |
Dimensions
| Overall length | 1026 mm |
|---|---|
| Overall width | 634 mm |
| Overall height | X: 1964 mm, U: 2091 mm, E: 2218 mm |
| Engine transom height | X: 640 mm, U: 767 mm, E: 894 mm |
| Steering angle | 32 deg. each direction |
| Dry weight | 293 – 304 kg |
Performance
| Maximum propeller shaft output | 257.4 kW |
|---|---|
| Full throttle operating range | 5000 – 6000 r/min |
| Idling speed | 650 – 700 r/min |
Bracket/Drive
| Shallow water drive | PTT: variable position |
|---|---|
| Gear shift | F-N-R |
| Gear ratio | 1.75 (21/12) |
| Gear oil capacity | 0.925 L / 0.885 L |