1992-1998 Kawasaki PWC Jet Ski Service Repair Manual., Page 205Get this manual
The pitted damage to this piston crown was probably caused by broken, piston ring working its way into the combustion, chamber, The little "hillsthen became 'hot" spots on the crown, contributing to "dieselingn after the
The rings on this piston were broken,possibly during installationr and then caused extensive damage to the pistonRing parts found their way into the combustion chamber and caused damage to the piston crown