ding ding ding you da man - Kent Howerton it is !
this was back in the day when large parts of the track were not fenced and you could cross the track during a moto
(crazy)
I only went to a couple big outdoor races and a bunch of supercross events. I went to the USGP at Carlsbad 3 times. Such a fun place, you could bring an ice chest and lawn chairs and set up anywhere around the track. I think the first time was 1971.
I also went to Saddleback once. It was a national event when they had 500cc, 250cc, and 125cc all on the same day. I think it was the last race there before the whole place was turned into a housing development. Same thing happened to Carlsbad.
Just remembered I went to an outdoor race in Las Vegas but I don't remember if it was called a national. I just remember Bob Hannah dragging his handlebar in the turns.