| Engine type | 4-stroke | Displacement | 139 cc |
| No. of cylinders/configuration | 1, OHV | Bore x stroke | 62.0 mm x 46.0 mm |
| Prop shaft output at mid-range | 2.9 / 4,500 rpm | Full throttle operating range | 4,000 – 5,000 rpm |
| Lubrication system | Wet sump | Fuel Induction System | 1-Carb |
| Ignition/advance system | CDI | Starter system | Manual |
| Gear ratio | 2.08 (27:13) | Recommended boat transom height | S435L : 562 mm |
| Weight with propeller | F4BMHS: 27.0kg, F4BMHL: 28.0kg | Fuel tank capacity | 1.1 litres (Built-in fuel tank) or optional separate fuel tank |
| Oil pan capacity | 0.6 litres | | |
