Troubleshooting - KYMCO AHG1 Maintenance Manuallines

7. CYLINDER/ PISTON

2.3. Troubleshooting

When hard starting or poor performance at low speed occurs, check the crankcase
breather for white smoke. If white smoke is found, it means that the piston rings are worn,
stuck or broken.
Compression too low or uneven compression

Worn or damaged cylinder and piston rings

Worn, stuck or broken piston rings
Compression too high

Excessive carbon build-up in combustion chamber or on piston head
Excessive smoke from exhaust muffler
 Worn or damaged piston rings
 Worn or damaged cylinder and piston
Abnormal noisy piston

Worn cylinder, piston and piston rings

Worn piston pin hole and piston pin

Incorrectly installed piston
7-4