2008 Arctic Cat ThunderCat ATV Service Manual, Page 48Get this manual
11With the timing inspection plug removed and the chains held tight, rotate the crankshaft until the front piston is at top-dead-center12With the alignment pin installed in the camshaft, loosely place the cam sprocket (with the recessed side facing the cam shaft lobes) onto the camshaftAt this point, do not "seat" the sprocket onto the shaft GZ190A
14Seat the cam sprocket onto the camshaft making sure the alignment pin in the camshaft aligns with the smallest hole in the sprocket; then place the camshaftsprocket assembly onto the cylinder ensuring the following
732-307B
APiston still at top-dead-centerGZ130