In Oregon your build must be considered one of the following a moped, motor assisted scooter or an electric bicycle. A moped can be self built but must meet moped requirements. A moped also requires a drivers license. A motor assisted scooter doesn't require a driver's license but does have a 35 cc limit. An electric assisted bicycle doesn't requires a driver's license. However if you have a suspended license you can't operate anything with an electric motor or gas engine on it.