2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 290Get this manual
12Install the cam chain tensioner with new gasket; then tighten the Allen-head cap screws to ft-lb13Install the spring and spring guide pin into the cam chain tensioner; then with new O-ring installed on the tensioner plug, install the plug and tighten to ft-lb
NOTE: The tappet shims must be installed with the numbers facing the tappet
15Oil the tappets, camshaft journals, and cylinder head journals with clean engine oil; then install the four camshaft holder alignment pins16With the TDC line aligned with the index mark on the magneto cover, install the camshafts with the engraved marks parallel with the top of the cylinder head and the and directed toward the intake or exhaust side of the head