1999 Polaris PWC Genesis, Ficht, X-45 Service Manual, Page 137Get this manual
ENGINE DisassemblyInspectionPolaris Engines
Piston InspectionMeasurement
1Check piston for scoring or cracks in piston crown or pin areaExcessive carbon buildup below the ring lands is an indication of pistonring or cylinder wear2, Measure piston outside diameter at pOint 10 mm (38") up from bottom of skirt at 90 angle to the direction of the piston pinRecord the measurement for each pistonNOTE: The piston must be measured at this point to provide accurate piston-to-cylinder clearance measurement3Subtract this measurement from the minimum cylinder measurement recorded previouslyIf clearance exceeds the service limit, determine if piston or cylinder is worn and recondition or replace as necessary
Piston Pin
Piston to Cylinder Clearance
STD: .0065.0075" (.165.191mm) Service limit: .011" (.279 mm)