1981 Grand Prix motorcycle racing season developed in the 1950s, to aluminium frames featuring large, twin beams as first pioneered by Spanish constructor, Antonio Cobas. The following Grands Prix were scheduled to take place in 1981: Points are awarded to the top ten finishers. A rider has to finish the race to earn points. 1981 Grand Prix motorcycle racing season The 1981 Grand Prix motorcycle racing season was the 33rd F.I.M. Road Racing World Championship season. Suzuki riders Marco Lucchinelli and Randy Mamola battled it out to the final race of the season with the Italian rider claiming the crown and Mamola finishing runner-up for the
1991 Grand Prix motorcycle racing season 1991: Points are awarded to the top fifteen finishers. A rider has to finish the race to earn points. Points are awarded to the top fifteen finishers. A rider has to finish the race to earn points. 1991 Grand Prix motorcycle racing season The 1991 Grand Prix motorcycle racing season was the 43rd F.I.M. Road Racing World Championship season. The beginning of the 1990s marked a golden age for Grand Prix motorcycle racing. The rivalry between Wayne Rainey and Kevin Schwantz was in full flow while Mick Doohan started to come into his own. Eddie Lawson had switched to Cagiva