1. I

    Looking for information about 'redline' and tachometer advice

    Hello all, The motor on my bicycle is an 80cc two stroke of the Umoto/Insight brand. So far, it's been a pretty sturdy little engine. I had two questions for ya'll today I haven't had much success in getting answered on my own. 1. Is a tachometer for an engine like this actually feasable...
  2. 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...