It shouldn't be getting too hot. I'm still running it on the rich side trying to use up the rest of a gallon of 10 / 20 (break in fuel). I'm going to see if I can find a museum somewhere that will part with a new ring and cylinder. I really don't want to junk it, when it's running right, the thing screams. But then again I've got it on a P51 PTS (ARF version) and it's only pulling 6 pounds. I had hopes of putting it on my Stinger when I get it built.