Re: 50cc or 80cc
well, the 50cc is a good thing simply due to legality. In most states, the 50cc and under class of engine doesn't require license, registration, or insurance. anything above that and the state wants their cut. I have a couple bikes selling right now, and whereas the 66cc (they call it 80 but that's BS) has more pull and out the gate torque, the 50cc slant head that I have is fairly comparable in speed and doesn't vibrate nearly as much as the 66cc, which is nice as it's kind of a pain in the butt to stop and tighten stuff up while you are riding..