2010 Arctic Cat DVX 90 / 90 Utility ATV Service Manual, Page 9Get this manual
3Remove the spark plug wire and the spark plug; then rotate the engine clockwise to the TDC position on the compression strokeNOTE: The "T" mark on the rotorflywheel is aligned with the timing pointer on the crankcase, and intake and exhaust valve adjuster screws must not have pressure on themThe two punch marks on the camshaft gear are aligned with the valve cover surface, and the hole in the timing gear points away from the engineYT170
5Check the valvetappet clearance after the jam nut has been tightened to ensure that the clearance did not change