The riding area by Bill's Pipes was not a public thing, it was two or three outdoor type tracks up in the Norco hills behind the shop. Bill always had three or four of the newest motocross bikes for pipe development and dyno work and he didnt care if we took them up in the hills for a gas tank or two.
I used to stay in LA for a week or two at a time so that was a great way to pass the days.