SPARK PLUG KEEPS FOULING:
1. Excessive enrichener use.
2. Fuel mixture too rich.
3. Incorrect spark plug or plug gap.
4. Incorrect ignition timing.
5. Air filter clogged.
6. Excessive “pumping” of the throttle grip.
PREIGNITION OR DETONATION (KNOCKS OR PINGS):
1. Incorrect fuel.
2. Incorrect spark plug.
3. Incorrect ignition timing.
4. Insufficient oil supply or oil circulation.
5. Heavy carbon deposit from lugging the engine.
6. Ignition timing retarded or overly advanced.
7. Carburetor set too lean.
(For Carbureted only).
8. No air flow over engine (stopping in traffic).
EXCESSIVE VIBRATION:
1. Front, rear and/or top engine mounting bolts loose.
2. Transmission mounting bolts loose.
3. Primary drive pulleys loose.
3. Wheels and/or tires damaged.
4. Vehicle not properly aligned.
5. Final drive belt badly worn.
6. Final drive chain badly worn or links tight as a result of insufficient lubrication or
improper adjustment.
3 . 5 T r o u b l e S h o o t i n g G u i d e
