Youichi Ui
Youichi Ui is a Japanese 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 Grand Prix motorcycle racing|Grand Prix motorcycle racing season|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 |
| 1995 | 125cc | Yamaha | 1 | 1 | 31st | |||||
| 1996 | 125cc | Yamaha | 13 | 1 | 36 | 18th | ||||
| 1997 | 125cc | Yamaha | 15 | 1 | 2 | 77 | 12th | |||
| 1998 | 125cc | Yamaha | 13 | 1 | 76 | 11th | ||||
| 1999 | 125cc | Derbi | 14 | 1 | 84 | 11th | ||||
| 2000 | 125cc | Derbi | 16 | 5 | 10 | 6 | 3 | 217 | 2nd | |
| 2001 | 125cc | Derbi | 16 | 6 | 8 | 7 | 5 | 232 | 2nd | |
| 2002 | 125cc | Derbi | 16 | 1 | 1 | 65 | 13th | |||
| 2003 | 125cc | Aprilia | 10 | 1 | 76 | 13th | ||||
| 2003 | 125cc | Gilera | 5 | 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 |