2007 Arctic Cat ATVs factory service and repair manual, Page 160Get this manual
11While 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 7Install the four cylinder head cap screws with washersNote that the two cap screws on the right side of the cylinder head nearest the cam sprocket are longer than the two cap screws on the left (spark plug) sideTighten only until snug
12With 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 .markson the camshaft sprocket are parallel with the valve cover mating surface1 NOTE: When the camshaft assembly is seated, make sure the alignment pin in the camshaft aligns with the smallest hole in the sprocket