That had a bad habit of the cam chain sawing the motor in half. I had one, what a stone. Looks like it had a 500 four lower end with little dinky jugs on top. Sold mine to some homeless guy who put a horse saddle on it, and some gigantic leather fringed handgrip protectors. He use to live in the LA river, and I guess one rainy season both he and the bike got washed out to sea. Maybe flounders are using it now as an artificial reef.I think they were 550's in '72, as I had a 1972 CB550Four. I always wondered about that.
What was the smallest four they made? Wasn't there a 360 or 350 four to go along with the 350 twin?