2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 85Get this manual
ENGINE 4Re-check the valve clearance5Repeat adjustment procedure if necessary until clearance is correct with locknut secured3Loosen hose clamps and remove coolant inlet hose
CylinderPiston Removal and Inspection
NOTE: Follow engine disassembly procedures to remove valve cover, camshaft and rocker arms, and cylinder head1Remove cam chain guide at front of cylinder
4Remove the two mm cylinder base bolts5Loosen each of the four large cylinder base bolts 14 turn at time in criss-cross pattern until loose and remove bolts