2005 Polaris Sportsman 400/500 Service Manual, Page 89Get this manual
PISTON-TO-CYLINDER CLEARANCE
Piston Pin Measurement Locations
Piston Pin 1Measure piston outside diameter at point 40 mm down from the top of the piston at right angle to the direction of the piston pin2Subtract this measurement from the maximum cylinder measurement obtained in Step abovePiston to Cylinder Clearance Std: .0006-.0018I (.015-.045 mm) Piston O.D Std: 3.6204-3.6215I (91.970-91.985 mm)