2009-2010 Polaris RZR Factory Service Manual, Page 86Get this manual
ENGINE Piston-to-Cylinder Clearance
Measure piston outside diameter at point mm up from the bottom of the piston at right angle to the direction of the piston pinSubtract this measurement from the maximum cylinder measurement obtained in Step 52Measure piston pin O.DReplace piston andor piston pin if out of tolerance
Piston to Cylinder Clearance: See "800 EFI Engine Service Specifications" on page 3.9