2008 Arctic Cat ATVs factory service and repair manual, Page 162Get this manual
6Remove the cap screw securing the chain tensioner (account for washer); then remove the tensioner 7While holding the chain, slide the sprocket and camshaft out of the cylinder head
9Remove the cylinder head from the cylinder, remove the gasket, and account for two alignment pins; then remove the cam chain guide
INOTE: Loop the chain over the cylinder and secure it to keep it from falling into the crankcase