2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 90Get this manual
ENGINE 4Measure piston ring to groove clearance by placing the ring in the ring land and measuring with thickness gaugeReplace piston and rings if ring-togroove clearance exceeds service limitsPiston Ring
Piston Ring Installed Gap
1Place each piston ring inside cylinder using piston to push ring squarely into place as shown at right2Measure installed gap with feeler gauge at both the top and bottom of the cylinderFeeler Gauge
Feeler Gauge