In this photo he’s jetting the carbs on one of the bikes at the San Jose Mile in, I think, 1975—I wasn’t big on labeling photos back then. I was just beginning my career as a motojournalist, and was wandering the pits that day taking photos courtesy of a press pass arranged for me by Cycle Guide magazine, where I would find myself on staff 10 years later.
I’ve read that Erv’s effort spurred Kel Carruthers to have a Champion frame built to accommodate Yamaha’s TZ750; the bike that resulted is the star of a video that’s been making the rounds lately (see it here).
Update: Now that I think about it, I wasn't yet freelancing in 1975; I didn't sell my first photo to Cycle Guide until 1980 or so. I recall now that around the time this photo was taken, they'd open a gate outside turn four during breaks between races so fans could cross the track and go to the pits. That's probably how I got there.
(photo by Jerry Smith)