Outboard motor · 350 HPYamaha F350US
Electronic control lever Drive-by-Wire (DEC)Steering: integrated electric (DES)Helm Master EX Level 2–4 (electric steering DES)Installation and rigging at the GRAND BOATS Poland service centre in Łężyce. Sold in cooperation with an authorised Yamaha dealer; manufacturer warranty 3 + 2 years at an authorised Yamaha service.
Yamaha F350US — 350 HP
Yamaha F350US is a four-stroke outboard motor rated at 350 HP (257,4 kW at the propeller shaft). Engine: 24-zaworowy, DOHC z VCT, 60° V6, displacement 4256 cm³, wtrysk paliwa. Dry weight: 293–304 kg.
A motor with integrated Yamaha DES digital electric steering: no pump or hydraulic hoses in the boat, a lighter installation, precise handling and ready for Helm Master EX with a joystick. Throttle and shift are digital (Drive-by-Wire). The model has electric start and power trim and tilt (PTT) — the motor angle is set with a button, even while underway.
Shaft length U (30″ / 762 mm). The shaft is matched to the boat’s transom height so that the anti-cavitation plate runs just below the water surface. Transom height for this shaft according to Yamaha: 767 mm.
Fuel consumption at full power according to Yamaha: 113,1 L/h @6000 obr/min. The F350US is within the power range the shipyard recommends for the GRAND G850, GRAND D950 Adventure, GRAND D950 Explorer, GRAND D950 Dive. At the GRAND BOATS Poland service centre in Łężyce near Gdynia we install the engine, do the rigging and choose the propeller. The engine is supplied in cooperation with an authorised Yamaha dealer; the manufacturer warranty (3 + 2 years) is carried out by an authorised Yamaha service.
Yamaha F350US
| Maximum output (at propeller shaft) | 350 KM (257,4 kW) |
|---|---|
| Full-throttle range | 5000–6000 rpm |
| Idle speed | 650–700 rpm |
| Fuel consumption (reference data) | 113.1 L/h @6000 rpm |
| Engine type | 4-stroke, 24-valve, DOHC with VCT, 60° V6 |
| Displacement | 4256 cm³ |
| Bore × stroke | 96,0 × 98,0 mm |
| Compression ratio | 11,0:1 |
| Fuel system | Fuel injection |
| Lubrication | Wet sump |
| Engine oil capacity | 7.9 L / 7.6 L (with / without filter change) |
| Ignition | TCI |
| Spark plug | ILMAR7E-9 |
| Alternator | 74 A (charging output: 50 A) |
| Trim | PTT: stepless |
| Gear ratio | 1,75 (21/12) |
| Gear shift | F-N-R (digital, DEC) |
| Steering | Digital electric steering (DES) |
| Propeller rotation | Right (standard) |
| Shaft lengths in the family | X, U, E |
| Overall height (U shaft) | 2091 mm |
| Transom height (U shaft) | 767 mm |
| Beam | 634 mm |
| Weight (dry) | 293–304 kg |
| Steering angle | 32° each way |
Source: Yamaha Product Information Guide 2026 (F350B family). Fuel consumption — manufacturer’s reference data.
