Manufacturer
Yamaha 2.5hp
Japanese manufacturer of marine propulsion and boat-control systems, including electric propulsion products.
Official manufacturer website ↗
2.5hp
Compact, confident and ready for anything, the 2.5hp is your all-access pass to fun on the water. From calm lakes to sheltered coves, this little legend brings Yamaha precision to life's simplest pleasures.
Key facts
- Family: Portable
- Engine type: OHV, 1-cylinder
- Displacement: 72 cm³
- Rated output: 1.8 kW
- Weight: S: 17 kg, L: 18 kg
- Operating range: 5250 – 5750 r/min
- Fuel system: 1 carburetor
Position in Yamaha range
The Portable family is focused on lower-output engines where mass, handling, storage and simple installation are key considerations.
This is model 5 of 5 in the Portable family when the range is ordered from higher to lower rated output.
Neighbouring models
- Higher-output neighbour: 4hp
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 | OHV, 1-cylinder |
|---|---|
| Displacement | 72 cm³ |
| Bore x stroke | 54.0 × 31.5 mm |
| Compression ratio | 8.8 : 1 |
| Fuel induction system | 1 carburetor |
| Lubrication system | Splash lubrication |
| Engine oil capacity | 0.25 L |
| Ignition / advance system | CDI |
| Alternator | Not available |
Dimensions
| Overall length | 625 mm |
|---|---|
| Overall width | 363 mm |
| Overall height | S: 1028 mm, L: 1155 mm |
| Engine transom height | S: 433 mm, L: 560 mm |
| Steering angle | 360 degree full pivot |
| Dry weight | S: 17 kg, L: 18 kg |
Performance
| Maximum propeller shaft output | 1.8 kW |
|---|---|
| Full throttle operating range | 5250 – 5750 r/min |
| Idling speed | 1800 – 2000 r/min |
Bracket/Drive
| Shallow water drive | Not available |
|---|---|
| Gear shift | F-N |
| Gear ratio | 2.08 (27/13) |
| Gear oil capacity | 0.075 L |