I found this motorcycle on eBay last August (cost = $900 :jawdrop: ). A guy in Napa had built it but for some reason (I neglected to ask) he wanted to sell the thing. He'd been careful to try and make it street legal so it could easily be registered.
The motorcycle is a 1980's era Suzuki. The rear end is from a golf cart. He said he found one with the beefiest motor you could get, for a golf cart. It's a 48 volt and he most strongly recommended not running it at any higher of a voltage. The controller is a very large Curtis. The battery pack is 80 amp-hour.
I've been rather busy and haven't had the time to get it to the DMV, hence it isn't registered yet. I've been redoing some of the wiring. But I really just want to take it to the DMV and see if they'll register it. The only real question I have is that there is no parking brake so perhaps the DMV will reject it.