2007 Arctic Cat ATVs factory service and repair manual, Page 161Get this manual
Camshaft
Alignment Hole
1 NOTE: At this point, oil the camshaft bearings,
cam lobes, and the three seating journals on the cylinder1 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
A CAUTION
Iare 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
17Apply red Loctite #271 to the first cap screv securing the sprocket and tab washer to the cam shaft; then install the cap screw and tab washer Tighten cap screw only until snug