If only someone could pattent a 200cc engine so it fits into a 50cc bicycle frame,now that's something....i'de buy it.
Back to the topic I saw this 4 person 49cc 4 wheel "bike" on the staton website http://www.staton-inc.com/Details.asp?ProductID=2443
It would be really tempting to get if I had somebody else who would want to ride it with me. Looks like it has a lot of potential with the right owner and its really cheap for whats essentially a car replacement. I wonder how much the cops would tweak out about it though...