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1990
Yamaha wins both 500 & 250cc class championships
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1991
Rainey makes it two in a row
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1992
Yamaha becomes engine supplier for 500cc class
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1993
Tetsuya Harada takes championship on a TZ250M
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1994
Cadarola ranked 2nd on the season with a win in the US GP
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1995
Yamaha unable to regain title
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1996
First-time wins for Norifumi Abe and Louis Capirossi!
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1997
6th placed ranking for Luca Cadalora
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1998
Yamaha takes first 500cc win in 22 races
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1999
Biaggi and Checa join Yamaha camp
