Hey, Andy I'm putting a friend's MC21 together. The oil injector pump shaft was missing, but he managed to get one along with a washer and o-ring (items 9 & 10 frame E14). I'm not sure how to assemble these. It seems to me that the shaft goes directly into the pump, and then the thrust washer and o-ring go on the other end to allow 2 stroke oil to lubricate the helical gears in the crankcase but not allow it to leak into the crankcase. But the only way to assemble it would be to mount the pump on the crankcase first and then install the clutch cover and mesh the helical gears as the water pump shaft slides into place. Is this correct? Or am I way off base?

TIA,

eric