I may be wrong but this beast may have made a lap or 2 at Westwood back in the day. http://www.superbikeplanet.com/image/archive/vegas12/yamaha/0.htm
I had the pleasure of sitting down and talking with Steve Baker a couple of summers ago when I was at Hannegan with Murray Newman. He was telling me that once a year that he and a bunch of the old fast guys go to Italy and ride all the period perfect racebikes they used in the day, and that the media over there tapes it and it's a huge deal. If anyone ever found one of those tapes I think we'd all weep watching it. I want someone to come up with footage of Art Robbins at Westwood on his RS500. One of the sexiest things I ever seen.
Ted I couldn't find any video of that race but I did find a site that has an ex Art Robbins RS 500 for sale so drool away. http://rmdmotors.com/1984-honda-rs500r-ex-richard-schlacter/