If your engine is hard to start or detonates under hard acceleration, try using 100 or 110 avgas, about 5 bucks a gallon at your local airport. If that is not an option add an additional base gasget to reduce compression, or have the head milled. Also a speed shop in Long Island showed me a compression release valve, like those found on 4 strokes, that had been installed in the head. He stated that it worked great,kiked over like a 125 till you let the lever go. hope this helps.
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