Thanks for the note. The engine has about 4 hours running time. It will run fine for a 10 minute flight the without changing any of the adjustments, die part way through the second flight. It dies while flying 1/3 to 1/2 throttle. It's a real puzzle to me. I'm told that they put a new carburator on it the last time I sent it in. But I'm not too sure as the throttle arm looked just like the one I had on the original carb. I enlarged one hole for a ball connector.

Any ideas?