There was a time when I was going after records with motorcycles on them, but not too many with SOHC 4s. The Jeannie C Riley LP "Girl Most Likely" has a superhawk, Kiss did a CB400 hawk "Kissmobile" model, there is a great picture of the Runaways on a sohc750 chopper but it's not a record cover, and I've got another one -- can't remember who it is -- with a CB160 and NYC in the background. There are tons of other examples of other bikes -- Arlo Guthrie's "running down the road" has him riding a Triumph. I'd love to see more SOHC ones though.