| 1983 |
Began to ride on a pocket bike at five |
| 1987 |
Champion - All Japan Pocket Bike Championship |
1989
|
Began the Minibike(50cc) race |
1992
|
Champion - Three regional Minibike championships |
1993
|
Champion - A regional Minibike championship |
| 1994 |
SP Tadao Racing Team
Champion - Suzuka Circuit Sunday Race Championship
Win - Suzuka 4hours Endurance Race |
| 1995 |
SP Tadao Racing Team
12th - All Japan Road Race Championship 125cc |
| 1996 |
SP Tadao Racing Team
6th - All Japan Road Race Championship 125cc |
| 1997 |
YAMAHA Racing Team
5th - All Japan Road Race Championship 250cc |
| 1998 |
BP YAMAHA Racing Team
Champion - All Japan Road Race Championship 250cc |
| 1999 |
Chesterfield YAMAHA Tech3
4th - 250cc World Championship (Rookie of the year) |
| 2000 |
Chesterfield YAMAHA Tech3
2nd - 250cc World Championship |
| 2001 |
Gauloises YAMAHA Tech3
5th - 500cc World Championship (Rookie of the year) |
| 2002 |
Gauloises YAMAHA Tech3
11th - MotoGP World Championship |
| 2003 |
D'antin YAMAHA Team
10th - MotoGP World Championship |
| 2004 |
Kawasaki Racing Team
10th - MotoGP World Championship |
 |
| 2005 |
Kawasaki Racing Team
MotoGP World Championship |
