This photo shows the late-great David Emde pitching his Bob Endicott-tuned Yamaha TZ250 into a turn at Portland International Raceway during the AMA 250 Grand Prix race there in 1983.
Notice how tight Emde is to the curbing. He likely has his knee planted in the uncut grass on the inside edge of the track.
That season Emde was locked in a fierce battle with newcomer Randy Renfrow for the series championship. Emde had already won the title in 1976. He won three rounds that season (Laguna Seca, Mid-Ohio and Talladega), but unfortunately for Emde, a few DNFs tipped the scale in favor of Renfrow, who went on to the championship.
Emde was one of the most versatile road racers of the late 1970s and early '80s. He raced just about every class in AMA National Road Racing, including Superbike and Battle of the Twins. He also did some World Endurance Championship racing and in '78 famously qualified on the pole and then finished second in the Suzuka 8 Hours with his teammate Isoyo Sugimoto racing a Yamaha TZ750!