Daytona Formula 1 race, 1980 or ’81. The AMA says: In addition to his Superbike exploits, Cooley also made history by becoming the first rider to win an AMA Formula One National on a four-stroke. It was at Road America in Elkhart Lake, Wisconsin, one of Cooley’s favorite tracks, where he rode a specially built Suzuki GS1000-based F1 bike to a win over the dominant two-stroke GP machines of the era. Cooley would go on to win two more AMA F1 Nationals on big 1000cc four-stroke bikes.

Also AMA Superbike championships for Yoshimura Suzuki in 1979 and ’80, and two Suzuka 8-Hours.