Three-time National champion Jimmy Weinert
(wearing a Kawasaki - naturally - lime green windbreaker), but piloting a SUZUKI (!) pit bike. #3...
See other image in this gallery of #3 Rich Thorwaldson on a Suzuki.
Weinert's way of saying that he's "riding" Thorwaldson, in his own inimitable way.
Ahhhh, politics comes to motocross.