I did my home work before I did the build . In the state of Michigan any bike with up to a 50cc motor has to be registered as a moped . It needs to have a headlight capable of reaching a certain distance [I don't remember how far] it also has to have a tail light , working brake light and a horn . I couldn't find any such thing as a brake light switch for these things so I fabricated one . After all that is met You have to have it inspected by local law enforcement and have the proper forms filled out from the secretary of state . after all that you can register it . Kind of a pain but Ive recently seen 2 of these bikes towed .