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1970
Rodney Gould wins the championship on a production racer
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1971
Fifth manufacturer's title for Yamaha in the 250cc class
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1972
Saarinen takes the championship title
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1973
Yamaha begins championship campaign in the pinnacle 500cc class
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1974
Giacomo Agostini joins the Yamaha team
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1975
Double title in the 500cc class
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1976
Yamaha suspends activities as factory team
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1977
Yamaha returns with works teams
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1978
Roberts takes the championship title
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1979
Roberts takes consecutive title
