Does anyone know the proper procedure for timing a new cam to the crank on a YS 91AC?

Align the mark on the drive washer with the parting line in the crankcase casting on the top side of the front bearing. There is a punch mark in the side of the cam gear which goes straight up.
BE SURE that it is straight up! Re-install the cam gear cover and you're ready to go.

Good Flying,
Dave

Thanks for the help Dave. I think I can handle it.

Troy