2007 Arctic Cat Four-Stroke Factory Service Manual, Page 63Get this manual
Valve Seat RepairNOTE: If the valve seat is beyond servicing, the cylinder must be replaced GEN-0026
GEN-0025
A valve seat not producing uniform contact with its valve or showing seating contact width that is not within the specified range must be repaired by cutting1Insert the expandable pilot shaft into valve guide; then install 45 cutter onto the pilot shaftGrind the valve seat by turning the cutter 1-2 turns using T-handle2Remove the pilot shaft and cutter; then coat the valve seat with blueing compound and insert the valve into the valve guideRotate the valve while tapping the valve head; then remove the valve and inspect the valve seat and valve face for proper width3The pattern produced on the seating surface of the valve and valve seat must be continuous ring without any break and the width of the pattern must be within specificationsGrind the valve seat width to 0.8-1.0 mm (0.0320.039 in4Inspect for dents or burning on the valve seat and, if necessary, rotate the 45 cutter another turn to smooth out the valve seat