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
1987 Portuguese Grand Prix one usable car which went to Brundle. With Piquet finishing third ahead of both Mansell and Senna, Piquet expanded his championship points lead to 18 points over Senna and 24 over Mansell. Numbers in brackets refer to positions of normally aspirated entrants competing for the Jim Clark Trophy. 1987 Portuguese Grand Prix The 1987 Portuguese Grand Prix was a Formula One motor race held at Estoril on 20 September 1987. It was the twelfth round of the 1987 Formula One season. It was the 16th Portuguese Grand Prix and the fourth to be held at Estoril. The race was held