2010 Polaris Sportsman 850 Service Manual, Page 126Get this manual
ENGINE CamshaftCamshaft Bore Inspection
1After camshaft carrier is removed, lift camshaft from cylinder headInspect all main journals and cam lobes as described below and compare to specifications (See "Engine SpecificationsEH085OLE013" on page 5.5)Replace if worn beyond service limit or if any surface is pitted or damagedMeasure all cam lobe heights from base circle to highest point on lobe
Cylinder Head Removal
1Loosen two outer bolts (A), then loosen all head bolts (B) evenly, 18 turn at time following the pattern below (6, 5, etc until all are looseRemove all bolts, cylinder head, and gasketNOTE: Head can be removed from cylindercrankcase without removing cam carrier (C) but the center two cylinder head bolts cannot be removed from the head unless carrier is removed