2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 120Get this manual
Inspecting Camshaft Bearing Journal 1Inspect the bearing journal for scoring, seizure marks, or pitting2If excessive scoring, seizure marks, or pitting is found, the cylinder head assembly must be replacedMeasuring Camshaft to Cylinder Head Clearance 1Remove the adjuster screws and jam nutsCC145D
6If clearance is excessive, measure the journals of the camshaft
2Place strip of plasti-gauge in each of the camshaft lands in the cylinder head3Place the valve cover on the cylinder head and secure with the valve cover cap screwsTighten securelyNOTE: Do not rotate the camshaft when measuring clearance