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
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
K-XCT 125i