So obviously i know laws vary from state to state. I live in maine and recently put a 49cc gas engine kit on my mountain bike. I bought it so i could commute to work, not horse around on, though that’s fun to do too. I’ve been all over the internet and Maine.gov and just haven’t found any concrete laws on it. i would hate to start commuting to work and be pulled over by a cop.

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

Under motorized scooter it says Can be used on a public way like a motorized bicycle or tricycle. either that is very poorly worded i am an idiot.