| Trouble | Symptom and possible causes | Remedy |
| Spark plugs develop exceeding carbon buildup too quickly | Carburetion too rich. | Adjust carburetor. |
| Idling speed set too high. | Adjust carburetor. | |
| Fuel does not meet specification. | Change fuel. | |
| Air cleaner dirty. | Clean. | |
| Spark plug heat rating too low. | Replace with a higher rating spark plug. | |
| Spark plugs become foul too quickly | Piston rings worn. | Replace. |
| Piston or cylinder worn. | Replace. | |
| Spark plug electrodes overheated or burnt out | Spark plug heat rating too high. | Replace with lower rating spark plug. |
| Engine overheats. | Adjust. | |
| Spark plug loose. | Tighten. | |
| Carburetion too lean. | Adjust carburetor. | |
| Alternator does not charge battery | Connection terminals interrupted, shorted or loose. | Repair, replace or tighten. |
| Generator coil shorted, discharging to earth or interrupted. | Replace. | |
| Regulator/rectifier shorted or faulty. | Replace. | |
| Generator is undercharging the battery | Terminals have a tendency to short-circuiting, becoming interrupted or working themselves loose. | Repair or tighten. |
| Generator stator coil discharging to earth or interrupted. | Replace. | |
| Regulator/rectifier faulty. | Replace. | |
| Faulty battery. | Replace. | |
| Generator is overcharging the battery | Short circuit inside battery. | Replace the battery. |
| Regulator/rectifier damaged or faulty. | Replace. | |
| Erratic regulator/rectifier ground. | Clean and tighten the ground terminals. | |
| Charge unsteady | Terminal insulator worn due to vibration is causing transient short circuits. | Repair or replace. |
| Short circuits inside generator. | Replace. | |
| Regulator/rectifier faulty. | Replace. |
Electrical system troubleshooting 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