| Type | 2-stroke single-cylinder engine with intake reed valve. Separate lubrication with variable-rate automatic mixer (1.0 - 3.0%). |
| Cylinders | 1 |
| Total displacement | 124.82 cu cm |
| Bore/stroke | 54 mm / 54.5 mm |
| Compression ratio | 12.5±0.5 : 1 |
| Starter | electric |
| Engine idling speed (rpm) | 1250±100 rpm |
| Clutch | Wet multi-plate clutch operated by manual control on left handlebar |
| Cooling | liquid cooling |
| Gearbox | 6-speed mechanical transmission with control pedal on left side of engine |
| Carburetor | DELL'ORTO PHBH 28 |
| Ignition | CDI |
| Spark advance | 12°±2° at 2000 rpm |
Engine general information (Aprilia RS125/3)
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- Information for owner
- Introduction to manual
- Maintenance
- Troubleshooting
- Engine and systems
- Engine repair
- Fuel system
- Cooling and lube system
- Running gear and frame
- Frame and hinged elements
- Front suspension and handlebar
- Rear suspension
- Brake system
- Wheels and tires
- Electric equipment
- Equipment and devices
- Starting and charging system