From the service manual it appears that there is a T mark between two of the cooling fins on the flywheel. Turn flywheel until that mark aligns with the ignition coil stud bolt for the number one cylinder which appears to be the cylinder on the right if looking down at the flywheel. and then align the two timing marks on the cam gear with the top edge of the head. and then turn the flywheel to align the mark with the stud for the number 2 cylinder and repeat for the second cam gear. That stud bolt is TDC of the respective cylinders.
