2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 196Get this manual
MD1254 MD1137
4Remove the cam chain tensioner pivot cap screw and washer
6Using an awl, rotate the C-ring in its groove until
it is out of the cylinder head; then remove the C-ring NOTE: Care should be taken not to drop the C-ring down into the crankcase
5Bend the washer tabs and remove the two cap
screws securing the sprocket to the camshaftMD1131