2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 184Get this manual

2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 184

12While holding the cam chain sprocket to the side, install the rear cam chain tensioner guide into the cylinder headInstall
marks on the camshaft sprocket are parallel with the valve cover mating surface NOTE: When the camshaft assembly is seated,
make sure the alignment pin in the camshaft aligns with the smallest hole in the sprocket Care must be taken that the tab
washer is installed correctly to cover the alignment hole on the sprocketIf the alignment pin falls out, severe engine damage
will result NOTE: Note the position of the alignment marks on the end of the camshaftThey must be parallel with the valve
cover mating surfaceIf rotating the camshaft is necessary for alignment, do not allow the chain and sprocket to rotate and
be sure the cam lobes end up in the down position 17When the camshaft assembly is seated, ensure the followingAPiston still
at top-dead-center BCamshaft lobes directed down (toward the piston)CCamshaft alignment marks parallel to the valve cover