2010 Polaris Sportsman 850 Service Manual, Page 124Get this manual
ENGINE ENGINE DISASSEMBLYINSPECTION
Valve CoverBreather Valve
123Remove (2) breather housing bolts (A)Inspect bellows (B) for cracks (not required for valve cover removal)Remove (6) rocker cover bolts (C) and isolators (D)Replace isolators and gasket (E) if oil leaks are evident"TOP" 2Remove cam chain tensioner bolts evenly and remove tensionerNote "TOP" marked on plate for assembly
Remove sprocket bolt and lift chain and sprocket off camshaftSecure cam chain with wire (if cylinder head will not be removed)