2007-2009 Kawasaki KFX50 service manual, Page 125Get this manual
8CYLINDERPISTON PISTON INSPECTION Inspect the piston, piston pin and piston ringsRemove the piston ringsTake care not to damage or break the piston rings during removalClean carbon deposits from the piston ring groovesInspect the piston wall for wearscratchesdamageIf any defects are found, replace the piston with new oneInstall the piston rings onto the piston and measure the piston ring-to-groove clearanceService Limits: Top: 0.09 mm (0.0036 in) 2nd: 0.09 mm (0.0036 in)