2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 90Get this manual

2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 90

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ENGINE Piston Ring Installed Gap
Feeler Gauge

Piston Ring-to-Groove Clearance Top Ring Std: .0016-.0031" (.040-.080 mm) Limit: .0059" (15 mm) Second Ring Std: .0012-.0028" (.030-.07