2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 18Get this manual
4Using an appropriate thickness gauge, measure and record the clearance of both intake valves; then measure and record the
number on the surface of the tappet shim; then refer to the appropriate tappet shim selection table at the end of this section
for the correct replacement 6Mark the valve tappets in order to return them to the proper position during assembly AMeasured
tappet clearance from step in vertical column on leftBPresent shim size horizontal row at the topCMatch measured clearance
in vertical column with current shim size in horizontal row to find recommended replacement size9Apply engine oil to both
surfaces of the tappet shim; then place the shim on the valve with the numbers toward the tappet2-9 7Fold suitable towel
and use it to plug the camshaft drive passageway; then using magnet, remove the tappet and shim from the appropriate valve.