Re: Buying a motorcycle or Vespa
I don't know about other states, but if you come from California you may have problems getting the scooter registered due to the emissions requirements. California has some requirements to fight air pollution that may require replacing the exhaust system on the bike. I would make sure that you can get the bike registered in the states before buying.
When we brought our car from the US to Germany, we had to replace the headlights and an essentially new set of tires (because they had DOT markings, but no DIN registration numbers). Even after that, we had to import parts (brake pads, etc.) from the US because they were different sizes than the EU models of the same car. I would imagine that, due to different laws, the case would be similar for motorcycles and scooters going in the other direction.