2004 Arctic Cat ATVs factory service and repair manual, Page 182Get this manual
12While holding the cam chain sprocket to the side, install the rear cam chain tensioner guide into the cylinder headInstall the pivot cap screw and washer 15Apply red Loctite #271 to the cap screws; then install the cap screws and tab washer to the camshaft sprocketTighten cap screws to 1.5 kg-m (11 ft-lb)13Place the C-ring into position in its groove in the cylinder head16Place the tab washer onto the sprocket making sure it covers the pin in the alignment hole
INOTE: At this point, oil the camshaft bearings, cam lobes, and the three seating journals on the cylinder
14With the alignment pin installed in the camshaft and the cam lobes directed down (toward the piston), place the camshaft in position and verify that the timing mark on the magneto is visible through the inspection plug and that the timing marks on the camshaft sprocket are parallel with the valve cover mating surfaceI NOTE: When the camshaft assembly is seated, make sure the alignment pin in the camshaft aligns with the smallest hole in the sprocket