Youichi Ui
Youichi Ui is a former Grand Prix motorcycle road racer. His best seasons were in 2000, when he finished second in the 125cc world championship behind Roberto Locatelli and in 2001, when he finished second behind Manuel Poggiali. With his 6 Grand Prix victories in 2001, Ui tied a record set by Kenny Roberts in 1983 of most wins by a rider without winning a championship. He raced in Japan in 2007, winning the All Japan 250cc Road Race Championship.By season
| Seas | Class | Moto | Team | Race | Win | Pod | Pole | FLap | Pts | Plcd | WCh |
| 1995 | 125cc | Yamaha | | 1 | | | | | 1 | 31st | 0 |
| 1996 | 125cc | Yamaha | | 13 | | | 1 | | 36 | 18th | 0 |
| 1997 | 125cc | Yamaha | | 15 | | 1 | 2 | | 77 | 12th | 0 |
| 1998 | 125cc | Yamaha | | 13 | | 1 | | | 76 | 11th | 0 |
| 1999 | 125cc | Derbi | | 14 | | 1 | | | 84 | 11th | 0 |
| 2000 | 125cc | Derbi | | 16 | 5 | 10 | 6 | 3 | 217 | 2nd | 0 |
| 2001 | 125cc | Derbi | | 16 | 6 | 8 | 7 | 5 | 232 | 2nd | 0 |
| 2002 | 125cc | Derbi | | 16 | | 1 | | 1 | 65 | 13th | |
| 2003 | 125cc | Gilera | | 15 | | | 1 | | 76 | 13th | |
| 2004 | 125cc | Aprilia | | 9 | | | | | 19 | 22nd | |
| 2004 | MotoGP | Harris WCM | | 3 | | | | | 1 | 28th | |
| 2006 | 250cc | Yamaha | | 1 | | | | | - | - | |
| 2007 | 250cc | Yamaha | | 1 | | | | | 2 | 27th | |
Races by year
| Year | Class | Bike | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | Pos | Pts |
| 1995 | 125cc | Yamaha | AUS
| MAL
| JPN
15 | SPA
| GER
| ITA
| NED
| FRA
| GBR
| CZE
| BRA
| ARG
| EUR
| | | | | 31st | 1 |
| 1996 | 125cc | Yamaha | MAL
Ret | INA
| JPN
Ret | SPA
17 | ITA
18 | FRA
15 | NED
14 | GER
Ret | GBR
10 | AUT
7 | CZE
Ret | IMO
Ret | CAT
6 | BRA
8 | AUS
| | | 18th | 36 |
| 1997 | 125cc | Yamaha | MAL
Ret | JPN
Ret | SPA
22 | ITA
10 | AUT
7 | FRA
4 | NED
5 | IMO
8 | GER
Ret | BRA
3 | GBR
Ret | CZE
10 | CAT
18 | INA
8 | AUS
Ret | | | 12th | 77 |
| 1998 | 125cc | Yamaha | JPN
Ret | MAL
Ret | SPA
7 | ITA
5 | FRA
11 | MAD
7 | NED
12 | GBR
3 | GER
Ret | CZE
Ret | IMO
6 | CAT
Ret | AUS
5 | ARG
15 | | | | 11th | 76 |
| 1999 | 125cc | Derbi | MAL
13 | JPN
4 | SPA
Ret | FRA
Ret | ITA
| CAT
Ret | NED
6 | GBR
7 | GER
Ret | CZE
5 | IMO
9 | VAL
Re | AUS
3 | RSA
7 | BRA
10 | ARG
| | 11th | 84 |
| 2000 | 125cc | Derbi | RSA
Ret | MAL
2 | JPN
1 | SPA
21 | FRA
1 | ITA
Ret | CAT
Ret | NED
1 | GBR
1 | GER
1 | CZE
2 | POR
Ret | VAL
3 | BRA
3 | PAC
Ret | AUS
2 | | 2nd | 217 |
| 2001 | 125cc | Derbi | JPN
2 | RSA
1 | SPA
Ret | FRA
11 | ITA
18 | CAT
5 | NED
Ret | GBR
1 | GER
19 | CZE
4 | POR
2 | VAL
4 | PAC
1 | AUS
1 | MAL
1 | BRA
1 | | 2nd | 232 |
| 2002 | 125cc | Derbi | JPN
Ret | RSA
Ret | SPA
6 | FRA
Ret | ITA
2 | CAT
Ret | NED
8 | GBR
8 | GER
8 | CZE
17 | POR
Ret | BRA
Ret | PAC
12 | MAL
12 | AUS
13 | VAL
Ret | | 13th | 65 |
| 2003 | 125cc | Gilera | JPN
6 | RSA
4 | SPA
8 | FRA
6 | ITA
6 | CAT
Ret | NED
4 | GBR
Ret | GER
Ret | CZE
9 | POR
DNS | BRA
21 | PAC
17 | MAL
18 | AUS
11 | VAL
Ret | | 13th | 76 |
| 2004 | 125cc | Aprilia | RSA
15 | SPA
7 | FRA
Ret | ITA
22 | CAT
18 | NED
Ret | BRA
Ret | GER
Ret | GBR
7 | CZE | POR | | | | | | | 22nd | 19 |
| 2004 | MotoGP | Harris WCM | | | | | | | | | | | | JPN
15 | QAT | MAL
19 | AUS
21 | VAL | | 28th | 1 |
| 2006 | 250cc | Yamaha | SPA | QAT | TUR | CHN | FRA | ITA | CAT | NED | GBR | GER | CZE | MAL | AUS | JPN
19 | POR | VAL | | NC | 0 |
| 2007 | 250cc | Yamaha | QAT | SPA | TUR | CHN | FRA | ITA | CAT | GBR | NED | GER | CZE | RSM | POR | JPN
14 | AUS | MAL | VAL | 27th | 2 |
