Engine troubleshooting information (Aprilia RS125/3)
- Main
- Aprilia
- RS-series
- RS 125 [3]
- Information for owner
- Troubleshooting
- Engine troubleshooting informa…
| Trouble | Symptom and possible causes | Remedy |
| Engine does not start or is difficult to start | Low compression | |
| Cylinder or piston rings exceedingly worn. | Replace. | |
| Piston ring sticking in its groove. | Repair or replace. | |
| Crankcase, cylinder or cylinder head gasket leaking. | Repair or replace. | |
| Loose spark plug. | Tighten | |
| Piston broken, cracked or damaged. | Replace. | |
| Crankshaft seal worn. | Replace. | |
| No spark | ||
| Foul spark plug. | Replace. | |
| Wet spark plug. | Clean and dry | |
| Defective coil. | Replace. | |
| High-tension cable interrupted or shorted. | Replace. | |
| Ignition system fault. | Repair or replace. | |
| Carburetor is receiving no fuel | ||
| Breather hole in filler cap clogged. | Clean. | |
| Fuel cock clogged or defective. | Clean or replace. | |
| Carburetor needle valve defective. | Replace. | |
| Fuel tube obstructed. | Clean. | |
| Foul spark plug. | Clean | |
| Ignition system fault. | Repair or replace. | |
| Fuel tube obstructed. | Replace. | |
| Carburetor jets obstructed. | Clean. | |
| Engine is burning oil | Oil pump out of adjustment. | Adjust. |
| Crankshaft seal damaged or worn. | Replace. | |
| Loss of engine power | Piston rings or cylinder worn. | Replace. |
| Incorrect air gap between spark plug electrodes or ignition system faulty. | Adjust or replace. | |
| Carburetor jets obstructed. | Clean. | |
| Incorrect fuel level in carburetor float chamber. | Adjust. | |
| Air cleaner clogged. | Clean. | |
| Air leaking past the intake duct. | Tighten or replace. | |
| Engine is receiving too much oil. | Adjust the oil pump. | |
| Engine overheats | Too much carbon build-up on piston crown. | Clean. |
| Engine is receiving insufficient oil. | Adjust the oil pump. | |
| Oil pump faulty or oilways obstructed. | Replace or clean. | |
| Fuel level in carburetor float chamber too low. | Adjust. | |
| Air leaking into intake duct. | Tighten or replace. | |
| Engine oil used does not meet specification. | Use specified oil. | |
| Cooling system faulty. | Read radiator section. |
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This article has been reviewed: Artemy Kuzmin
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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