2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 273Get this manual
Inspecting Camshaft Bearing Journal
1Inspect the bearing journal for sconng, seIzure marks, or pitting2If excessive scoring, seizure marks, or pitting is found, the cylinder head assembly must be replaced
Measuring Camshaft to Cylinder Head Clearance
ATV-1068
1Remove the adjuster screws and jam nuts
Measuring Camshaft Runout
NOTE: If the camshaft is out of tolerance, it must be replaced
1Place the camshaft on set of blocks; then position the dial indicator contact point against the shaft and zero the indicator
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 securelyCC283D