| 1986 | Spanish Grand Prix · Grand Prix | Cagiva | 8 | | Classified |
| 1986 | Italian Grand Prix · Grand Prix | Cagiva | — | | Ret |
| 1986 | German Grand Prix · Grand Prix | Cagiva | — | | DNS |
| 1986 | Austrian Grand Prix · Grand Prix | Cagiva | — | | Ret |
| 1986 | Yugoslavian Grand Prix · Grand Prix | Cagiva | 12 | | Classified |
| 1986 | Dutch TT · Grand Prix | Cagiva | 10 | | Classified |
| 1986 | Belgian Grand Prix · Grand Prix | Cagiva | 20 | | Classified |
| 1986 | French Grand Prix · Grand Prix | Cagiva | 20 | | Classified |
| 1986 | British Grand Prix · Grand Prix | Cagiva | — | | Ret |
| 1986 | San Marino Grand Prix · Grand Prix | Cagiva | — | | NC |
| 1990 | Japanese Grand Prix · Grand Prix | Yamaha | 10 | | Classified |
| 1990 | United States Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1990 | Spanish Grand Prix · Grand Prix | Yamaha | 9 | | Classified |
| 1990 | Nations Grand Prix · Grand Prix | Yamaha | 8 | | Classified |
| 1990 | German Grand Prix · Grand Prix | Yamaha | 7 | | Classified |
| 1990 | Austrian Grand Prix · Grand Prix | Yamaha | 9 | | Classified |
| 1990 | Yugoslavian Grand Prix · Grand Prix | Yamaha | — | | Ret |
| 1990 | Dutch TT · Grand Prix | Yamaha | 6 | | Classified |
| 1990 | Belgian Grand Prix · Grand Prix | Yamaha | 9 | | Classified |
| 1990 | French Grand Prix · Grand Prix | Yamaha | 8 | | Classified |
| 1990 | British Grand Prix · Grand Prix | Yamaha | 7 | | Classified |
| 1990 | Swedish Grand Prix · Grand Prix | Yamaha | 8 | | Classified |
| 1990 | Czechoslovak Grand Prix · Grand Prix | Yamaha | 5 | | Classified |
| 1990 | Hungarian Grand Prix · Grand Prix | Yamaha | 5 | | Classified |
| 1990 | Australian Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1991 | Japanese Grand Prix · Grand Prix | Yamaha | 7 | | Classified |
| 1991 | Australian Grand Prix · Grand Prix | Yamaha | — | | Ret |
| 1991 | United States Grand Prix · Grand Prix | Yamaha | 8 | | Classified |
| 1991 | Spanish Grand Prix · Grand Prix | Yamaha | 4 | | Classified |
| 1991 | Italian Grand Prix · Grand Prix | Yamaha | 8 | | Classified |
| 1991 | German Grand Prix · Grand Prix | Yamaha | 7 | | Classified |
| 1991 | Austrian Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1991 | European Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1991 | Dutch TT · Grand Prix | Yamaha | 12 | | Classified |
| 1991 | French Grand Prix · Grand Prix | Yamaha | 11 | | Classified |
| 1991 | British Grand Prix · Grand Prix | Yamaha | 9 | | Classified |
| 1991 | San Marino Grand Prix · Grand Prix | Yamaha | 7 | | Classified |
| 1991 | Czechoslovak Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1991 | Vitesse du Mans Grand Prix · Grand Prix | Yamaha | 6 | | Classified |
| 1991 | Malaysian Grand Prix · Grand Prix | Yamaha | 4 | | Classified |