Hi Y'all- Success! And I learned something too. Ends of push-rod tubes have rather large radiused surfaces that contact O-ring seals, top and botom. Radius is too large for tube ends to fit nicely into O-rings. Tube ends can be pushed aside, leaving a gap along an edge. Aparently that's what happened in my son's crash last fall. Irony is that I could have re-centered the one push rod end with my thumb and saved myself a lot of putzing around, such as with the regulator diaphragm!

Runs almost right now. But I am not out of the woods yet. Won't idle down to 2000 rpm, even with throttle barrel entirely closed. About 2800 is minimum. Also won't stay idling and low-speed adj does not have as much effect as it should. Must still have an air leak somewhere. I have ordered new gasket set and O-rings.

IMO, YSs are Great! when they are running right. And Not! when they're Not!!!

Thanks for your help.

Regards. -Gary