Michel Rougerie (1978)
His best year was in 1975 when he won two races and finished in second place in the 250cc world championship behind his Harley-Davidson team-mate Walter Villa. Rougerie actually scored more points than Villa that season, but because only the best six results of the season were counted, he lost the championship.
Points system from 1969 onwards:
(key) (Races in bold indicate pole position; races in italics indicate fastest lap)