2008 Arctic Cat ThunderCat ATV Service Manual, Page 13Get this manual
Testing Engine Compression To test engine compression, use the following procedure1Remove the high tension leads from the spark plugsGZ063
2Using compressed air, blow any debris from around the spark plugs
NOTE: At this point, the rocker arms and adjuster screws must not have pressure on themNOTE: Use Valve Clearance Adjuster for this procedure
! WARNING
Always wear safety glasses when using compressed air
3Place the valve adjuster onto the jam nut securing the tappet adjuster screw; then rotate the valve adjuster dial clockwise until the end is seated in the tappet adjuster screw4While holding the valve adjuster dial in place, use the valve adjuster handle and loosen the jam nut; then rotate the tappet adjuster screw clockwise until friction is felt5Align the valve adjuster handle with one of the marks on the valve adjuster dial6While holding the valve adjuster handle in place, rotate the valve adjuster dial counterclockwise until proper valvetappet clearance is attainedNOTE: Refer to the appropriate specifications in Feeler Gauge Procedure sub-section for the proper valvetappet clearanceNOTE: Rotating the valve adjuster dial counterclockwise will open the valvetappet clearance by 0.05 mm (0.002 in per mark