Motorized Scooters, Go-Karts, Mini-Bikes, Dirt Bikes and Motor-assisted Bicycles

You cannot register any of these motorized devices in NYS. You cannot operate these devices on sidewalks, public streets or highways in NYS. These devices are classified as motor vehicles, but the devices do not have the correct equipment or design to operate on roadways. If you operate an unregistered motor vehicle on a street or a highway in NYS, law enforcement officials can arrest you and give you a ticket for the violation of several traffic laws. The DMV web site has more information about motorized devices.
http://nysdmv.custhelp.com/app/answers/detail/a_id/74/~/scoo...

http://www.maine.gov/sos/bmv/registration/scooter.html