2007-2009 Kawasaki KFX50 service manual, Page 128Get this manual
8CYLINDERPISTON Intake Side Guide
Inspect the exhaust side and intake side chain guidesWear or Damage Replace
Exhaust Side Guide
PISTON INSTALLATION Remove any gasket material from the crankcase surfaceBe careful not to drop foreign matters into the crankcaseInstall the piston, piston pin and new piston pin clipPosition the piston "IN" mark on the intake valve sidePlace clean shop towel in the crankcase to keep the piston pin clip from falling into the crankcase"IN" Mark