2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 92Get this manual
ENGINE 7Remove large sealing O-Ring from outer edge of stator plate3Remove cam chain (E)Inspect chain for worn or missing rollers or damageStretch chain tight on flat surface and apply 10 lb(4.53 kg) loadMeasure length of 20 pitch section of chainReplace if worn past service limitCam ChainTensioner Blade
1Remove bolt securing tensioner blade to crankcase (D)D