Harbor freight has the stamps. Also for the laws check municode.com, I was really worried about getting some kind of ticket on mine I did some research and found that they are legal in the city ordanance. I was so happy, I printed off a copy, and carry it around with me. Cops do not know the CC it looks like a 49cc to me. Just never say moped, say pedal assisted bicycle. Take your bike into the local Police department and register it as a bicycle, and then put an engine on it after registration. For a back up plan. Just be cool on it and you probably won't have to worry even if it is illegal technacally.