Hmmm, I never knew there was an RG500 back in the 70's. Maybe, the early to mid 80's street bike that we all know was designed around the 70's race bike only ?
That's correct - Sheene won back to back 500cc world titles in 76 and 77 on an RG500.
The street bike engine is very, very similar to the race motor in terms of dimensions and architecture. The factory race motors used special materials (magnesium crankcases etc) but if you look at the race components vs street components side by side, apart from obvious things like single-ring pistons for the race bikes, the two are blood brothers.
It's also relatively easy to take a street RG motor to race levels of power (unlike, say, the Yam RD/RZ 500 which apart from being a V4, is quite unlike the race engine)
1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
There's a name from the past, Rodger De Coster. Looks like he's aboard a RM370? Been with Suzuki for a large part of his career in racing and managing/coaching. I think he's still active in motocross but I remember seeing him with KTM now?
Its funny how some names stick in your head for people you followed in sports.
Take these three from motocross:
Roger 'the man' DeCoster
Gerrit 'the dutch dentist' Wolsink
Danny 'Magoo' Chandler, sadly Danny passed away a while ago, he was simply insane on a bike when he got it right.
This video sums him up, Roger and Brad talking about Danny.