I remembered that at one time Kenny Roberts ran a US team of 500 GP Yamahas, so I was curious and started net surfing.
Over an hour later after a lot of dead-end bs, I could not remember the sanctions name, this came up and I had what I was looking for.
https://www.youtube....h?v=SCjICNCorM4
There is an interesting 250 rider in the video.
Rich Oliver
Robbie Petersen
This is one of three photos of Rich Oliver on the 500, but his absolute dominance in the AMA 250 GP class, also on a Yamaha, was the stated reason that class was eliminated.
His fellow rider Robbie Peterson, and they battled for the championship.
I did find that two fellows, by the name of Knott and Knipp also raced Two Stroke GP bikes in WERA/Formula USA.
Jim Knipp - YZ500 J
Boonie Knot - RG500 -- TZ250
When AMA switched to the support series of Superbike, and Formula USA killed the run-what-you-brung formula, that was the beginning of the slide of motorcycle racing in the U.S. from motorsport headlines to -- do they still do that.
Edited by Bob Riebe, 02 March 2022 - 01:25.