2009 Arctic Cat 150 ATV Service Manual, Page 27Get this manual
CleaningInspecting Cylinder Head 1Using non-metallic carbon removal tool, remove any carbon build-up from the combustion chamber making sure not to nick, scrape, or damage the combustion chamber or the sealing surface2Inspect the spark plug hole for any damaged threadsRepair damaged threads using "heli-coil" insert3Place the cylinder head on the surface plate covered with #400 grit wet-or-dry sandpaperUsing light pressure, move the cylinder head in figure eight motionInspect the sealing surface for any indication of high spotsA high spot can be noted by bright metallic finishCorrect any high spots before assembly by continuing to move the cylinder head in figure eight motion until uniform bright metallic finish is attained KM710A
Removing Valves
NOTE: Keep all valves and valve components as setNote the original location of each valve set for use during installationReturn each valve set to its original location during installation
! CAUTION
Water or parts-cleaning solvent must be used in conjunction with the wet-or-dry sandpaper or damage to the sealing surface may result