2007-2009 Kawasaki KFX50 service manual, Page 123Get this manual
8CYLINDERPISTON TROUBLESHOOTING When hard starting or poor performance at low speed occurs, check the crankcase breather for white smokeIf white smoke is found, it means that the piston rings are worn, stuck or brokenCompression too low or uneven compression Worn, stuck or broken piston rings Worn or damaged cylinder and piston 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 piston rings Abnormal noisy piston Worn cylinder, piston and piston rings Worn piston pin hole and piston pin