Hi. I was flying my Sig Wonder with an OS .25 FX engine (Cool Power 15%) this weekend and had some engine issues. It was 100 degrees. The engine was set to be slightly rich to the point that the throttle response was slightly boggy; however, any high speed-full throttle pass I attempted, the engine would stop. No problems at 1/4 or 1/2 throttle.

Does heat affect these engines to a great degree? I guess I can make it even richer, but I'd hate to have the engine bog down in flight and risk having it stop due to that.