1. Oil leak: Check for any visible oil leaks around the bottom of the engine. If you find a leak, it is likely that the oil is burning off, causing smoke.
2. Piston ring failure: Piston ring failure can cause oil to leak into the combustion chamber, where it can burn off and produce smoke. Check the condition of the piston rings and replace them if necessary.
3. Head gasket failure: A failed head gasket can also cause oil to leak into the combustion chamber, leading to smoke. Check the condition of the head gasket and replace it if necessary.
4. Crank seal failure: A failed crank seal can allow oil to leak out of the engine, which can burn off and produce smoke. Check the condition of the crank seal and replace it if necessary.
5. Worn out piston: A worn out piston can cause oil to leak into the combustion chamber, which can burn off and produce smoke.
Note: If you are unsure of the cause of the smoke, it is best to take your pit bike to a qualified mechanic for diagnosis and repair.
