ロリス・カピロッシ
Newcomer John Kocinski took the 250 title for Kenny Roberts' Marlboro-Yamaha squad after a tight points battle with Carlos Cardús that was not decided until the final race of the season. Despite five Grand Prix victories for Hans Spaan, seventeen-year-old Loris Capirossi became the youngest-ever world champion when he claimed the 125 crown for Honda.