Re: 50cc vs 80cc?
A huge thing is legality - many states have a 50cc limit on street legal bikes.
The crankcase is all the same size - though you'll have different head bolt sizes going into it (if I remember right).
I actually think the carb is the same on most (when talking NT), just jetted differently. There is the 66cc NT Speed Carb designed for the 66cc/80cc motors.
The difference to me was 5MPH stock, and way better acceleration.
Last edited by DuctTapedGoat; 06-12-2011 at 02:08 AM.