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  1. C

    Engine Trouble Losing rpm once engine gets hot

    Ive finally built a screamer (almost). When I first top out my 66cc motor from the start, I'm hitting about 8500 rpm(36mph). I have a high compression head, I've raised the exhaust and redirected the transfer ports and installed an expansion chamber. I'm running a B7HS plug. Here's the problem...
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