I had my Twist out yesterday as it has an Evo .46 in it. While running the engine full, you could see the needle valve knob turn!!!!!!
You could even see the "O" ring. We had it turned out 4 turns and 1/2 turn. Didn't make a bit of difference. We decided it may be
that some dirt or foreign matter may have gotten in. So we pulled out the needle and just blew air threw it. Seemed to help.
I flew it 3 flights after that without too much trouble.

Dave...