1983 Grand Prix motorcycle racing season championship. In a fitting end to a successful career, Roberts won his last-ever Grand Prix race, however Spencer was able to secure second place to claim the world championship. The two riders dominated the season with each claiming six victories and six pole positions in the 12 race series. The following Grands Prix were scheduled to take place in 1983: Points are awarded to the top ten finishers. A rider has to finish the race to earn points. 1983 Grand Prix motorcycle racing season The 1983 Grand Prix motorcycle racing season was the 35th F.I.M. Road racing World Championship season.
2002 Grand Prix motorcycle racing season at the Rio de Janeiro Grand Prix, with four races left in the season. The 250cc title was won by Marco Melandri who won nine races and scored 298 points. He clinched the title at the Australian Grand Prix and became the youngest ever champion in the 250cc class. Arnaud Vincent won the 125cc title by 19 points difference over defending champion Manuel Poggiali. The title was decided in the last race of the season at Valencia with Vincent finishing in second place to secure the title. The season marked the start of a new era in the premier class