Regarding laws and engine size, a lot of 49cc riders are in a bind in neighboring Massachusetts. The dealers there read the law to their advantage and sold people 49cc scoots that went faster than 25mph, unrestricted speed. So Mass got smart and started going by advertised specs of the scooters. If it advertises going over 25mph, then it is a limited use vehicle and you need a motorcycle license, registration (and I believe insurance, but am not positive). 25mph or under is a moped and does not need a motorcycle license, registration, or insurance. Of course anything 50cc or larger is a motorcycle. The upshot is a lot of used 49cc scoots are now for sale in Mass, since they almost all advertise as going over 25mph. People in Mass are royally pissed!