2007 Arctic Cat Four-Stroke Factory Service Manual, Page 60Get this manual
When servicing valve assembly, inspect valve seats, valve stems, valve faces, and valve stem ends for pits, burn marks, or other signs of abnormal wear! NOTE: Discard any valve that fails the listed inspectionsDo not grind the valvesIf valve is damaged, it must be replaced Measuring Cylinder Head Distortion
1Using non-metallic carbon removal tool, remove any carbon buildup from the combustion chambers being careful not to nick, scrape, or damage the combustion chambers or the sealing surfaces2Inspect the spark-plug holes for any damaged threadsRepair damaged threads using helicoil insert3Inspect the cylinder head for flatness using straightedge and feeler gaugeAcceptable distortion must not exceed specifications! NOTE: If the distortion exceeds specification, replace the cylinder head
ATV-1004
2Acceptable valve face width must be within specificationsMeasuring Valve Face Runout