Yoshimura GS750 8V exhaust?

[Chuck78]

The red bike looks real good, and like it's got a short swingarm.
The black bike, don't like chrome or polished frames… street cruiser, show bike bling/bling.

All Rickman's ever made came only in Nickel plated frames. Even their motocross bikes and the post-Rickman-Brothers offshoot companies Mettisse Motorcycles and the other one going under the name Rickman. The red one has its frame painted black, but the swingarm is still nickel plated.

All the Rickman CR swingarms were a good bit on the short side. Craig Vetter had Don or Derek Rickman custom make a 1" longer swingarm for his racer. Longer means substantially better suspension geometry under acceleration out of turns. The swingarm angle stays more constant with a longer swingarm under the same amount of travel as a shorter swingarm. Rapidly changing swingarm angle will make you steer wide out of turns due to the squat tendencies once the swingarm gets near horizontal or beyond. Newer bikes run the longest swingarm possible with engines that have more compact transmissions, therefore they are able to slam the swingarm pivot much further forward and maintain a short wheel base.

Craig Vetter Rickman CB750 racer recollections @ AMA Museum:

https://youtu.be/KIODvXkARD4

[Buffalo Bill]

The rider on the red bike, he must be kinda tall because his elbow and knee are overlapping. I think that bike ain't his, looks like it's set up for somebody 10" shorter than him, the handlebars are set back behind the fork tubes.

[limeex2]

He texted me a picture of one he said was the same style, THIS:





He did tell me Yoshi series 1. I found this on kzrider:
"my original series 1 had yoshimura racing engraved on about a 2 mm plate that was welded onto the muffler."

you can see the welded on name tag he mentioned on this GS1000 pipe:

the old b/w 750 pics are running a Bassani Pipe. You can tell by the bend in the midpipe and the hanger. I have one for a 1000

[Chuck78]

You sure about that? The head pipes are clearly hand bent as witnessed by the long sweeping constant radius and lack of any tight bends. This was a 1978 model team Yoshimura race bike, I'm not sure there would have been aftermarket parts for a GS1000 in its introductory year.
Pops was well known for hand bending his exhaust systems

[limeex2]

You are right .I stand corrected. The Bassani's have distinctly sharper bends.