2011 Arctic Cat 350/425 ATV Service Manual, Page 84Get this manual
6Place new gasket into position on the cylinderPlace the alignment pins into position; then place the head assembly into position on the cylinder making sure the cam chain is routed through the chain cavity
CAUTION
Keep tension on the cam chain to avoid damaging the crankcase boss
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 marks on the camshaft sprocket are parallel with the valve cover mating surface