| Trouble | Symptom and possible causes | Remedy |
| Difficulties on starting | Starter jet obstructed. | Clean. |
| Starter duct obstructed. | Clean. | |
| Air leaking past the gasket between cold-start body and carburetor. | Check and tighten. | |
| Cold-start shutter is malfunctioning. | Repair. | |
| Erratic operation at idling speed or in the low speed range | Idle jet obstructed or loose. | Check and clean. |
| Air leaking past the S.I.P.C. tube of carburetor or cold-start device. | Check. | |
| Idle outlet or by-pass hole obstructed. | Check and clean. | |
| Cold-start shutter does not close fully. | Check and adjust. | |
| Erratic operation in the mid-to-high speed range | Main jet obstructed. | Check and clean. |
| Build-up sticking to tapered needle. | Check and clean. | |
| Throttle valve malfunctioning. | Check throttle valve operation. | |
| Filter obstructed. | Inspect and clean. | |
| Erratic overflow and fuel level | Needle valve worn or damaged. | Replace. |
| Float is malfunctioning. | Check and adjust. | |
| Debris build-up on needle valve. | Clean. | |
| Fuel level too high or too low. | Adjust float height. | |
| Carburetor breather hose obstructed. | Clean. | |
| Needle valve spring broken. | Replace. |
Carburetor troubleshooting information (Aprilia RS125)
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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
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