Re: Now I own *two* DAX GT50r motors........
Sorry, I'm not much help.....while I am somewhat mechanically inclined-diagnosing 2 stroke motor problems isn't my strong suite.
I know the basics and that's about it.
I know they have a centrifugal clutch......maybe roll it a down a long hill and go fast enough for the clutch to engage the motor-give it some gas and see what happens.
If some's good...more is better and too much ain't enough.