This Craigslist Ad for an RZ500 is short on details, so I'll just post the whole thing:
Street legal 4 cyl. 2 stroke street bike!Lots of time and money invested!Have all original parts as well.This bike runs and rides perfectly!GREAT street bike!Lots of fun to own and ride!Call if you have any questions
But these aren't exactly easy to come by. If you're in the market, $9500 might be a touch on the high end. But the pictures do look awfully good...