Outboard motor · 4 HPYamaha F4SMHA
formerly F4BMHS
TillerInstallation 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 warranty: 5 years (3 years + 2 years extension) for recreational use, 2 years for commercial use.
Yamaha F4SMHA — 4 HP
Yamaha F4SMHA is a four-stroke outboard motor rated at 4 HP (2,9 kW at the propeller shaft), successor to the F4BMHS. Engine: OHV, 1-cylindrowy, displacement 139 cm³, 1 gaźnik. Dry weight: 27, 28 kg.
The tiller version — you steer directly with the handle, with throttle and shift at hand, no console or cables. A practical choice for inflatables, tenders and smaller RIBs. The model has manual pull start and manual angle adjustment (trim in several positions).
Shaft length S (15″ / 381 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: 435 mm.
Fuel consumption at full power according to Yamaha: 1,7 L/h @4500 obr/min. The F4SMHA is within the power range the shipyard recommends for the GRAND S275. 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 F4SMHA
Performance
| Maximum output | 4 hp (2.9 kW) |
|---|---|
| Full-throttle range | 4000–5000 rpm |
| Idle speed | 1450–1550 rpm |
| Fuel consumption (reference data) | 1.7 L/h @4500 rpm |
Engine
| Engine type | 4-stroke, OHV, single-cylinder |
|---|---|
| Displacement | 139 cm³ |
| Bore × stroke | 62,0 × 46,0 mm |
| Compression ratio | 8,9:1 |
| Fuel system | 1 carburettor |
| Lubrication | Wet sump |
| Engine oil capacity | 0,6 L |
| Ignition | CDI |
| Spark plug | CR6HSB |
| Starting | Manual |
| Alternator | 6 A with rectifier-regulator (option) |
Bracket / lower unit
| Steering | Tiller |
|---|---|
| Steering angle | 90° each way |
| Trim and tilt | Manual |
| Trim positions | 5 positions |
| Gear shift | F-N-R |
| Gear ratio | 2,08 (27/13) |
| Propeller rotation | Right-hand (standard) |
| Shaft length | S: 15″ / 381 mm |
| Transom height (S shaft) | 435 mm |
| Overall height (S shaft) | 1039 mm |
| Beam | 403 mm |
| Weight (dry) | 27 kg |
Source: Yamaha Product Information Guide 2026 (F4B family). Fuel consumption — manufacturer’s reference data.
2,75 m Length
1,55 m Beam
2,5–10 HP Engine power
0,40 m Tube diameter
53 kg Weight
3 Number of people
440 kg Load capacity
1 Number of engines
S: 15 cali / 381 mm Transom height
D CE category