Try to swap out the 8.0s flywheel with the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=ASCC8647&P=K]MGT4.6 fan Flywheel [/link], better cooling. check compression.
ohh forgot to tell you dont lean it out to much they run on the rich side, but not too rich.
rich = more fuel in there = more lubrication = cooler run
