I got this from and email received 6 or 7 months ago. The best I could glean form it, is the author might be a Chris Story. If more accurate information comes to light, please feel free to add to it.
"Yes, you read that right; these little beasties are street legal. They run on either Kawasaki or Honda motorcycle engines and co-opt vintage bumper car bodies into the most awesome form of mini-car we've seen in too long.
There are seven of these little monsters floating around California , and they're all the creation of one man, Tom Wright, a builder in the outskirts of San Diego who figured the leftovers of the Long Beach Pike amusement park needed a more dignified end than the trash heap. They were originally powered by two cylinder Harley Davidson Motorcycle engines but they rattled like heck because of the two cylinder vibration and Tom replaces them with four cylinder Honda or Kawasaki 750's and a couple have been measured as capable of 160 MPH, which is terrifyingly fast in machines with such a short wheelbase. By the way, they are almost indestructible in accidents!"
What Do You Do With Old Bumper Cars?