I don't have an over heating problem, as I have checked it with a new infra-red raytek minitemp, I checked the head behind the exhaust port and it read 178 degrees, I believe this is a little cold, tells me I'm running too rich. I tried moving the cline regulator back to just before the high speed needle and there were air bubbles galore. I also tried the tuning method mentioned earlier, but after doing this and seemingly getting it to run good and idle at around 1800 rpm and transition smoothly and no mid-range sputtering, the damn thing won't start again, even after letting it cool. So, I opened the low end needle a half turn and now it will start, but the mid-range sputters again. Either this thing has gone ultra sensitive and I can't tune it or something else is wrong. Any more suggestions?