My Dynamix carb was made in the late Seventies. Put it on a .90 and it had enough air moving through it at sufficient velocity to make it easy to adjust. Put that same carb on a .61 with a pipe and you had to use a pump in most models for it to work properly. I don't know about any other year of carb - just the one I owned. By the time one bought the Webra engine and a fuel pump, you could have spent the same money and gotten the YS .60 which was mostly trouble-free. Yes, I know that there are folks that had problems with the YS .60. I didn't.


Ed Cregger