2009 Arctic Cat 400/500/550/700/550/700/1000 ATV Service Manual, Page 133Get this manual
CC011D CC266D
4Using an awl, rotate the C-ring in its groove until it is out of the cylinder head; then remove the C-ringNOTE: Care should be taken not to drop the C-ring down into the crankcase
NOTE: 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 tensioner