Has anyone ever won an AMA National or Supercross Championship on a European bike?
Gary Jones—1974 AMA 250 National Champion.
short your memory is! Grant Langston won the 2003 125 National
Championship on a KTM. Before Grant's breakthrough victory you would
have to go back to Kent Howerton's 1976 500 National Championship on a
Husqvarna. If you aren't picky, you could count Jimmy Ellis' 1975
Supercross Championship and Gary Jones' 1974 250 National Championship.
Ellis and Jones rode for the Can-Am team. Can-Am was technically a
Canadian motorcycle, but it's engine was built in Austria by Rotax. Mark Blackwell won the first 500 AMA National Championship on a Husqvarna in 1971.