I'm going to use this thread because it's about the same engine. OK. I'm using fuel from the same can for both my engines so I don't think it's a dirt issue. One runs like a watch and the new one, the one I just got back from YS is giving me some problems. I'll try to explain it and maybe you can help me. I went to the field yesterday and after a tank of fuel I had given up. I start it, it starts very easy. Let it warm up about a minute at about half T. Ease it up to full and set the high needle to top RPM and back off a few clicks till it gives me some smoke. Bring it back to idle. It was too slow, I mean just barely running so I had to set the servo trim up to get it to idle. When try to go back to full T it dies and fuel runs out of the carb. Kept working at it making very small adjustments to the regulator, never moved it past 1/4 out or in. I finally got it to transition, though not without some blubbering. In other words it won't quickly go to full T. Anyway I put the wing on and taxied out and it died when I tried to throttle up for take off. We started it again and I ran it up to clear it and brought it back down and took off. Flew it for 10 minutes and set for landing but it was idling too fast I guess because I had to keep trimming back to get it slow enough to land. Thing is, everytime I came in too hot I throttled up and went around again and it ran ok, never getting over half throttle. Finally got it slowed down enough to land but it died when I turned around and gave it more throttle to get it back to the pits. I tried doing what you said above but that actually made it run worse. You said use the idle at 2220-2400 but isn't that kinda fast? Sounds fast to my ear.