Spooky Tooth Cycles
Came across these guys in my travels. They are called Spooky Tooth Cycles and are based in Tuscon Arizona. By combining standard bicycles with small two stroke engines, Spooky Tooth are creating some cool looking motor-cycles for their own thrill seeking purposes. They even fought the law in Arizona (and won) to have these bikes legal without registering them. Check this link to read more about that story.