2008 Arctic Cat ATVs factory service and repair manual, Page 213Get this manual
5Bend the washer tabs and remove the two cap screws securing the sprocket to the camshaft; then drop the sprocket off the camshaftWhile holding the chain, slide the sprocket and camshaft out of the cylinder head INOTE: Loop the chain over the cylinder and secure it to keep it from falling into the crankcase
6Remove the cap screw securing the chain tensioner (account for washer); then remove the tensionerCC011 D
4Using an awl, rotate the C-ring in its groove until it is out of the cylinder head; then remove the C-ring iNOTE: Care should be taken not to drop the C-ring down into the crankcase