2008 Arctic Cat ThunderCat ATV Service Manual, Page 12Get this manual
ValveTappet Clearance (Feeler Gauge Procedure)
To check and adjust valvetappet clearance, use the following procedure1Remove the timing inspection plug; then remove the tappet covers (for more detailed information, see SectionServicing Top-Side Components)NOTE: Remove the crankshaft end cap and install the special cap screw (left-hand threads) to rotate the engineGZ059
5Install the timing inspection plug; then remove the cap screw and install the crankcase and cap6Place the two tappet covers into position making sure the proper cap screws are with the proper coverTighten the cap screws securely
2Rotate the crankshaft to the TDC position on the compression strokeNOTE: At this point, the rocker arms and adjuster screws must not have pressure on them
3Using feeler gauge, check each valvetappet clearanceIf clearance is not within specifications, loosen the jam nut and rotate the tappet adjuster screw until the clearance is within specificationsTighten each jam nut securely after completing the adjustment