[1][2] The motocross series was an invitational based on a combined 250 and 500cc engine displacement formula, run on American tracks featuring the top riders from the F.I.M.
BSA factory rider Dave Nicoll claimed the championship without winning a single event, due to his consistent results.
The Suzuki team of Joel Robert and Olle Petterson didn't join the event until the third race of the series.
Robert went on to dominate, but his late start hurt his chances to claim the overall championship.
[1][2] LaRue, Ohio (250cc) Unadilla, New York (250cc) Delta, Ohio (500cc) Franklin, Georgia (500cc) Lewisville, Texas (250cc) Irvine, California (500cc) Carlsbad, California (250cc) Puyallup, Washington (500cc)