Dougs ride was impressive but he seemed to have a few riders up his arse at the finish, would have been a good race to watch.
The other riders were Guy Cooper (1990 US 125 champ)and Scott Burnsworth ( factory Yamaha and Suzuki )
Best racing you could ever watch back in the day was Guy Cooper in 2nd place
That 100cc Marty Tripes series is primarily in California. The rest of the county will have maybe 3 100cc bikes on a gate. Can't say why a 100 class would take off so big. I would think a 125 class would be bigger as they are easier to find.