Outboard motor · 20 HPYamaha F20LWHB
formerly F20GWHL
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 F20LWHB — 20 HP
Yamaha F20LWHB is a four-stroke outboard motor rated at 20 HP (14,7 kW at the propeller shaft), successor to the F20GWHL. Engine: SOHC, rzędowy 2, displacement 432 cm³, wtrysk paliwa. Dry weight: 56–66 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 and electric start and manual angle adjustment (trim in several positions).
Shaft length L (20″ / 508 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: 551 mm.
Fuel consumption at full power according to Yamaha: 7,5 L/h @6000 obr/min. The F20LWHB is within the power range the shipyard recommends for the GRAND S420 N. 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 F20LWHB
Performance
| Maximum output | 20 hp (14.7 kW) |
|---|---|
| Full-throttle range | 5000–6000 rpm |
| Idle speed | 850–950 rpm |
| Fuel consumption (reference data) | 7.5 L/h @6000 rpm |
Engine
| Engine type | 4-stroke, SOHC, in-line 2 |
|---|---|
| Displacement | 432 cm³ |
| Bore × stroke | 65,0 × 65,1 mm |
| Compression ratio | 9,1:1 |
| Fuel system | Fuel injection |
| Lubrication | Wet sump |
| Engine oil capacity | 1.1 L / 1.0 L (with / without filter change) |
| Ignition | TCI |
| Spark plug | DPR6EB-9 |
| Starting | Manual and electric |
| Alternator | 16 A |
Bracket / lower unit
| Steering | Tiller |
|---|---|
| Steering angle | 45° each way |
| Trim and tilt | Manual |
| Trim positions | 4 positions |
| Gear shift | F-N-R |
| Gear ratio | 2,08 (27/13) |
| Propeller rotation | Right-hand (standard) |
| Shaft length | L: 20″ / 508 mm |
| Transom height (L shaft) | 551 mm |
| Overall height (L shaft) | 1233 mm |
| Beam | 378 mm |
| Weight (dry) | 62 kg |
Source: Yamaha Product Information Guide 2026 (F20G family). Fuel consumption — manufacturer’s reference data.
4,20 m Length
1,95 m Beam
20–50 HP Engine power
0,43–0,46 m Tube diameter
115 kg Weight
6 Number of people
700 kg Load capacity
1 Number of engines
L: 20 cali / 508 mm (standard) / S: 15 cali / 381 mm Transom height
C CE category