2001 Arctic Cat ATVs factory service and repair manual, Page 201Get this manual
NOTE: At this point, oil the camshaft bearings, cam lobes, and the three seating journals on the cylinder Fig3-732
13With the cam lobes directed down (toward the piston), maneuver the camshaftsprocket assembly through the chain and towards its seating position; then loop the chain over the sprocketFig3-730
APiston still at top-dead-centerBCamshaft lobes directed down (toward the piston)CCamshaft alignment marks parallel to the valve cover mating surfaceCC015D
DRecessed side of the sprocket directed toward the cam lobesECamshaft alignment pin and sprocket alignment hole (smallest) are aligned
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 positionFig3-731