could it be something as simple as bad gas??? he sais it is running lean, if it were running lean raw gas would not be coming out of the exhaust, i believe if raw gas is coming out it is running to rich. also if compression is down, it might be the rings, but when rich it runs like a big bag of ass. Since it is running hot though this leans towards why they say it is lean. why does thsi rig have a aftermarket cam though? i would think this might be the timing/biggest problem.