2011 Arctic Cat 450/550/650/700/1000 ATV Service Manual, Page 34Get this manual
NOTE: Care should be taken not to drop the C-ring down into the crankcase FI607A
6Noting the timing marks for installing purposes, drop the sprocket off the camshaftWhile holding the cam chain, slide the sprocket and camshaft out of the cylinder headAccount for an alignment pinNOTE: Loop the chain over the cylinder and secure it to keep it from falling into the crankcase
4Bend the washer tabs and remove the two cap screws securing the sprocket to the camshaft