Engine Specifications – F5AMHS & F5AMHL
| Engine Type | OHV, 1-Cylinder |
| Displacement | 139cm³ |
| Bore x Stroke | 62.0 x 46.0mm |
| Compression ratio | 8.9:1 |
| Starting enrichment | Manual Choke |
| Fuel induction system | 1 Carburettor |
| Lubrication system | Wet sump |
| Engine oil capacity | 0.6L |
| Ignition system | CDI |
| Ignition timing | BTDC 8.0 – BTDC 21.0 deg. |
| Spark plug | CR6HSB |
| Alternator | 6 A with Rectifier Regulator * Optional |
| Cooling system | Raw-water, thermostatically controlled |
| Exhaust system | Under Water |
| Dry weight | 28kg |