2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 89Get this manual
ENGINE Piston-to-Cylinder Clearance
1Measure piston outside diameter at point 40 mm down from the top of the piston at right angle to the direction of the piston pinPiston
PistonRod Inspection
1Measure piston pin bore
Piston Pin Bore Piston Pin Bore: .9055.9057" (23.023.006 mm) Piston Pin 2Measure piston pin O.DReplace piston andor piston pin if out of tolerance
2Subtract this measurement from the maximum cylinder measurement obtained in Step above
Piston to Cylinder Clearance