Not sure it was over heated - the temp outside was only 40F and when the engine stop I could touch it without issue. As for too lean, during the checking my L needle was 1.75 turns out and the H need was 1.5 turns out. That is a 1/2 a turn on the rich side compaired to the factory setting. The only mod to the engine is the Jet Pro v2 pipe.

Are these engine like Nitro were you can damage them if they are run too cool?