Yamaha F20B HP Outboard Engines - RRP from £2,299
Small engine convenience. Big-engine performance
This sleek, stylish twin-cylinder 4-stroke outboard engine is a class leader.
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This outbaord engine is easy to handle and control. It provides strong performance, smoothness, fuel economy, reduced exhaust emissions, and amazing versatility. Add in some features normally only found on larger engines, such as computer-controlled ignition, special light-load starting system, water-cooled fuel pump and large-volume silencer, to see why it is the perfect choice for commercial, professional or leisure use.
Yamaha F20B hp four stroke outboard engine features:
- Primestart - chokeless system - easy as starting your car
- Labyrinth exhaust system - Quiter running speeds
- Fresh water flushing system - reduces corrosion and extends engine life
- Shallow water drive
- Manual and electric start options
This engine has a 362cc capacity powerhead, which offers excellent torque to punch a boat up onto the plane, combined with very low engine noise and great fuel economy. On the tiller control models, not only is the gear lever mounted at the front of the engine maximum for operator convenience and comfort, but a quick adjust steering friction lever is also mounted at the front. A 10 amp alternator is standard on all models, as is Yamaha’s almost legendary reliability. Choose between a standard and long shaft model with hand start, tiller control, or electric start, remote control. Also available are some remote control, electric start models which even have power tilt, enabling the operator to tilt the engine at the press of a button
Yamaha outboard engines technical specifications


Yamaha Outboard Engines Technical Specifications
| Yamaha Outboards Specifications | F20B | F25 | F30 |
|---|---|---|---|
| RRP from: | £2,229 | £2,449 | £3,399 |
| Engine type | 4-Stroke | 4-Stroke | 4-Stroke |
| Number of cyclinders / Configuration | 2/In-line | 2/with balancer | 3/In-line |
| Bore x Stroke (mm) |
63 x 58.1 | 65 x 75 | 65 x 75 |
| Displacement (cm3) |
362 | 498 | 747 |
| Full throttle range (rpm) |
5000-6000 | 5000-6000 | 4500-5500 |
| Prop shaft output at mid range (kW/rpm) |
14.7/5500 | 18.4/5500 | 22.1/5500 |
| Weight with propeller (kg) Weight without propeller (kg)* |
F20BMHS: 51.7 F20BMHL: 53.7 F20BES: 52.7 F20BEL: 54.7 F20BEPS: 58.7 F20BEPL: 60.7 |
F25AMHS: 62.0 F25AMHL: 64.0 F25AES: 65.0 F25AEL: 67.0 F25AETL: 71.0 |
F30AMHDS: 83.8 F30AMHDL: 88.1 F30AETS: 86.1 F30AETL: 90.4 |
| Recommended boat transom height (mm) |
S: 381 L: 508 |
S: 381 L: 508 |
S: 381 L: 508 |
| Carburettors | 1 | 1 | 3 |
| Electronic fuel injection | - | - | - |
| Fuel tank capacity | Seprate, 25 | Seprate, 25 | Seprate, 25 |
| Oil pan capacity (litres) |
1.6 | 1.7 | 2 |
| Lubrication | Wet-sump | Wet-sump | Wet-sump |
| Ignition / Advance system | CDI/Computer | CDI/Computer | CDI/Computer |
| Lighting coil / alternator | 12V - 10A | 12V - 6A (AM) 12V - 15A (AE, AET) |
12V - 6A (AM) 12V - 15A (AE) |
| Gear ratio | 13:27 | 13:27 | 13:26 |
| Starter system | Manual (AM) Electric (BE) |
Manual (AM) Electric (AE, AET) |
Manual (AM) Electric (AE) |
| Steering | Tiller (BM) Remote control (BE) |
Tiller (AM) Remote control (AE, AET) |
Tiller (AM) Remote control (AE) |
| Throttle and shift controls | Twist grip (BM) F-N-R/front shift (BM) Single lever remote control (BE) |
Twist grip (AM) F-N-R/front shift (AM) Single lever remote control (AE, AET) |
Twist grip (AM) F-N-R/front shift (AM) Single lever remote control (BE) |
| Trim & tilt method (Trim angle) |
Manual (BM) (0°,4°,8°,12°) Power Tilt (BE) |
Manual (AM, AE) (8°,12°,16°,20°,24°) Power Trim and Tilt (AET) |
Power Trim and Tilt (AET) Hydro tilt assist (AMHD) |
| Number of Propeller options Size range (ins) |
8 6½ - 12 |
9 8 - 14 |
19 9 - 17 |
* The kW data is based on the ICOMIA 28 standard, measured at the prop shaft