Rich Oliver leads the pack early on his Marlboro/Team Roberts Yamaha YZR500 in a 1991 WERA Formula USA National at Moroso Motorsport Park in West Palm Beach, Fla. Directly behind Oliver is Donald Jacks (59), racing his home track on the Valvoline Suzuki. Following Jacks is Robbie Petersen on the second Marlboro/Robert Yamaha GP bike. Then comes Chuck Graves (24) Michael Martin (mostly hidden behind Graves), Kurt Hall (60) and 1989 Daytona 200 winner John Ashmead (37).
Great video of Ben Spies and Eddie Lawson discussing the motorcycles they rode to world championships.
By the way, Spies was born the year Lawson won his first 500cc Grand Prix World Championship.