Came across your site via a link from Bike EXIF. Neat stuff ...
I campaigned an R5 "back in the day" in California in the ACA, AFM, & AMA. Won the 72 & 73 AFM 350 Production Championships on my "ole R5". In 1973 I added the 6 speed gearbox and the front disc brake from the RDs. Here's some shots you might enjoy:
My 1st Race, OCIR... Rode to the race, finished 5th out of 39 starters.
3 Different ideas about the "correct line". (Turn 6 at Riverside)
From left to right:
Me in the Blue & White leathers, R5
Scott Clough in the middle (RD350)
Rod Murufas on the right on his RD350
Finish order that day was Clough 2nd, Murufas 3rd.
Riverside in '73 after adding the RD front disc brake.
Not an R5, but the Jim & Jim's/ND Spark Plugs RD400 that I campaigned in the 400 box stock class. 16 wins, no defeats.
Thanks so much for sending these in!