2008 Arctic Cat DVX 400 ATV Service Manual, Page 13Get this manual
3Select replacement tappet shim that will provide the proper clearanceNOTE: Tappet shims are available in 25 sizes from 2.30-3.50 mm (0.09-0.14 in in 0.05 mm (0.002 in increments 5Install the camshaft (see Section 3)6Rotate the crankshaft through two full revolutions to ensure that all excess oil is squeezed from the valvetappet clearance to make sure it is within specifications7Apply Three Bond Sealant to the camshaft end caps of the valve cover gasket; then install the valve cover8Tighten the valve cover cap screws to specifications (see Section 10)9Install the spark plug and tighten to specifications (see Section 10); then install the timing inspection plug