I'll be at Hobby Hut Sunday, and my engine hit 400 degrees because I was tearing around the track with only front wheel drive, rear pinion stripped out and I wasn't going to drive 8 hours to DNF, so I just kept at it LOL, engine came in temping at 420, let it cool, and it fired right back up. Wouldn't idle cause it lost all it's compression, but it started. But yea, 1 turn in I've found to be way too lean, I get better temps with it 1/2 turn, and better all around performance without any stutter or bog anywhere in the powerband. With it 1 turn in it would hesitate a little after a squeezed the gas and it would temp at around 250-260 even getting good smoke down the straights