Well I'm flipping it with a stick the same as when it started before. All I've done though is the rich break in then I tuned it just shy of peak on the high speed last time I ran it.
I get a little grunt on about 1/2 my flips, so it's trying. I've also primed it well so I know there is at least some fuel in the engine.
It's a ST 51 by the way.

Any help?