2005 Polaris Sportsman 400/500 Service Manual, Page 90Get this manual
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Piston Ring-to-Groove Clearance Top Ring Std: .0016-.0031I (.040-.080 mm) Limit: .0059I (15 mm) Second Ring Std: .0012-.0028I (.030-.070 mm) Limit: .0059I (15 mm) 4 Measure piston ring to groove clear