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
Portuguese Grand Prix Portuguese Grand Prix The Portuguese Grand Prix ("Grande Prémio de Portugal") was a motorsports event held for several years, mostly in the 1950s and then in the 1980s and 90s. It was a Formula One race between and and between and . The first event was held on the Boavista street course in Porto on 17 June 1951 as a sports car race. The Grand Prix was moved to Monsanto Park, Lisbon, in 1954 as a one-off. Monsanto, like the Boavista circuit was a hazardous street circuit lined with trees and had lots of elevation change and fast sweepers; but