Tom Wright of San Diego rescued some old bumper cars from the Long Beach Pike amusement park. Tom mounted them on a frame and originally powered them with two cylinder Harley Davidson Motorcycle engines. However, he has since switched to four cylinder Honda or Kawasaki 750's.
There are 7 of these things floating around southern California and they are supposedly street legal. The linked article claims a couple are capable of reaching 160 mph, but I suspect that claim is stretching the blanket more than a little. Regardless, they're nifty little mini cars. I want one!
The pictures and information are from a post at Dale's Designs: What Do You Do With Old Bumper Cars? You can see more pictures of the bumper cars if you follow the link.