2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 237Get this manual
CLUTCHING 4Visually inspect PTFE thrustwasher for damageMeasure the thickness and compare to specificationReplace if worn or damaged
One-Way Clutch Inspection (EBS Drive Clutch)
1Rotate one-way clutch clockwise (as viewed from the cover plate side)The clutch should rotate on the shaft with only slight amount of dragVerify there is no binding or rough spotsWhen rotated counterclockwise, the clutch should lock to the shaft without slippingIf problems are noted in either direction, continue with disassembly
= In mmPTFE Washer Thickness Standard: .030" (.76mm) Service Limit: .025" (.64mm)