Troubleshooting - KYMCO Downtown 125i 2009 Service Manual

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7
. CYLINDER/PISTON

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
7-3
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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
DOWNTOWN 125i