One guy at the cruise was bent over studying an engine, I asked him if he was a 750 guy, he replied he was looking to see if I had a Don Johnson engine. Don owned the local Honda shop and built himself some awesome engines. There were stories of turbo liter bikes, webers, big bore strokers etc. He made sure his was the fastest one around.
My brother owned one a few years ago when nobody (him or me) was doing anything with 750's and he told Don about it. He came right over and bought it, now it's gone, along with Don. No idea where it went. His partner's estate sale included loads of cb500 new old stock parts.