I know this doesn't answer the complete question, but its insightful. try this site: http://en.wikipedia.org/wiki/List_of_motocross_World_Championship_results
4 championships
2 championships 1997 & 1998
2 championships - 2001 and 2002
4 championships.
2
4
2
3 1966,1970,1983
they won 9 championships
Mike Hialwood has won 9 Motorcycling Championships.
3
None