Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which has been divided into three classes: MotoGP, Moto2, and Moto3. Former classes that have been discontinued include 350cc, 250cc, 125cc, 50cc/80cc, MotoE, and Sidecar. The Grand Prix Road-Racing World Championship was established in 1949 by the sport's governing body, the Fédération Internationale de Motocyclisme (FIM), and is the oldest motorsport world championship in existence. The 350cc referred to the size of the engines of the motorcycles that participated in the class. The engines had four cylinders, similar to the types of engines used in MotoGP today. The 350cc class existed from 1949 until 1982.
Points earned in these events count toward the riders' and constructors' world championships. These two are separate championships, but are based on the same point system. The points systems used in the championship varied over the years. The first championship in 1949 awarded 10 points to the race winner with 8, 7, 6, and 5 points from second place to fifth place, a point was also awarded for the rider who completed the fastest lap. The last championship in 1982 awarded 15 points for a win, with 12, 10, 8, 6, 5, 4, 3, 2, and 1 point from second place to tenth place. Results from all Grands Prix counted towards the championships; however, in some seasons only a certain number of results were counted.
Giacomo Agostini has won the most championships, with seven. Jim Redman has won the second-most championships, with four, and John Surtees has won the third-most championships, with three. Johnny Cecotto is the youngest rider to win the championship; he was 19 years old when he won in 1975. British riders have won the most championships; seven riders have won a total of 13 championships. Italian riders have won the second-most championships; two riders have won a total of eight championships. Riders from Rhodesia have won the third-most championships; two riders have won a total of five championships. MV Agusta was the constructor whose riders won the most championships, with a total of 10 championships. Honda was second with six championships, and Moto Guzzi was third with five championships. Freddie Frith won the inaugural championship in 1949. Anton Mang was the last champion before the class was discontinued after 1982.
Champions +KeyChampion also won the 500cc championship in that seasonChampion also won the 250cc championship in that seasonIndicates information is not available
The "Season" column refers to the season the competition was held, and wikilinks to the article about that season. The "Margin" column refers to the margin of points by which the winner defeated the runner-up.
By season +350cc World Riders' Champions by seasonSeasonCountryRiderConstructorGrands PrixPolesWinsPodiumsFastest lapsPointsMargin1949Velocette555533151950Velocette63443061951Norton855440211952Norton74443281953Moto Guzzi83523481954Moto Guzzi945538161955Moto Guzzi746532141956Moto Guzzi63342471957Moto Guzzi63413081958MV Agusta76653281959MV Agusta666548321960MV Agusta52432201961MV Agusta74553261962Honda645232101963Honda75753241964Honda888740161965Honda94533861966Honda106664861967Honda86654081968MV Agusta777732141969MV Agusta1088790431970MV Agusta1099990321971MV Agusta1166890271972MV Agusta12677102131973MV Agusta114638471974Yamaha10155575131975Yamaha1034567819197610445776111977Yamaha11057795391978Kawasaki1146910134571979Kawasaki1155599991980Bimota-Yamaha604566331981Kawasaki86578103511982Kawasaki911678117
Multiple champions +350cc multiple championsRiderTotalSeasons 7 1968, 1969, 1970, 1971, 1972, 1973, 1974 4 1962, 1963, 1964, 1965 3 1958, 1959, 1960 2 1951, 1952 2 1953, 1954 2 1955, 1956 2 1966, 1967 2 1978, 1979 2 1981, 1982
By constructor +350cc World Riders' Champions by constructorConstructorTotal MV Agusta10 Honda6 Moto Guzzi5 Kawasaki4 Yamaha3 Norton2 Velocette2 Harley-Davidson1 Bimota-Yamaha1
By nationality +350cc World Riders' Champions by nationalityCountryRidersTotal71328252312111111
Notes
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