MFJ All Japan IA1 Motocross
| 2026 | |
| 2025 | Yuki Okura |
| 2024 | Jay Wilson |
| 2023 | Jay Wilson |
| 2022 | Toshiki Tomita |
| 2021 | Kei Yamamoto |
| 2020 | Kei Yamamoto |
| 2019 | Kei Yamamoto |
| 2018 | Akira Narita |
| 2017 | Kei Yamamoto |
| 2016 | Akira Narita |
| 2015 | Yohei Kojima |
| 2014 | Akira Narita |
| 2013 | Akira Narita |
| 2012 | Akira Narita |
| 2011 | Akira Narita |
| 2010 | Yoshitaka Atsuta |
| 2009 | Akira Narita |
| 2008 | Akira Narita |
| 2007 | Akira Narita |
| 2006 | Yoshitaka Atsuta |
| 2005 | Takeshi Koikeda |
| 2004 | Akira Narita |
| 2003 | Akira Narita |
| 2002 | Akira Narita |
| 2001 | Yoshitaka Atsuta |
| 2000 | Ryuichiro Takahama |
| 1999 | Kyle Lewis |
| 1998 | Kyle Lewis |
| 1997 | Jeff Matlasevich |
| 1996 | Jeff Matlasevich |
| 1995 | Jeff Matlasevich |
| 1994 | Ron Tichenor |
| 1993 | Ron Tichenor |
| 1992 | Eddie Warren |
| 1991 | Takayuki Miyauchi |
| 1990 | Toshio Fukumoto |
| 1989 | Atsushi Okabe |
| 1988 | Yasuo Tohfukuji |
| 1987 | Yasuo Tohfukuji |
| 1986 | Yasuo Tohfukuji |
| 1985 | Steave Martin |
| 1984 | Steave Martin |
| 1983 | Yoshifumi Sugio |
| 1982 | Yasuo Tohfukuji |
| 1981 | Toshio Fukumoto |
| 1980 | Yoshifumi Sugio |
| 1979 | Tetsumi Mitsuyasu |
| 1978 | Tetsumi Mitsuyasu |
| 1977 | Katsuhiko Seo |
| 1976 | Masaharu Takezawa |
| 1975 | Kohji Masuda |
| 1974 | Hideaki Suzuki |
| 1973 | Hideaki Suzuki |
| 1972 | Tadao Suzuki |
| 1971 | Kohichi Ueno |
| 1970 | Taichi Yoshimura |
| 1969 | Tadao Suzuki |
| 1968 | Takashi Yamamoto |
| 1967 | Takashi Yamamoto |
Series Name
- (1967-2004) : All Japan 250cc Motocross
All-time Round Wins
| Akira Narita | 78 |
| Yoshitaka Atsuta | 27 |
| Jay Wilson | 21 |
| Kei Yamamoto | 18 |
| Kyle Lewis | 12 |
| Kazumasa Masuda | 11 |
| Jeff Matlasevich | 11 |
| Makoto Ogata | 8 |
| Ryuichiro Takahama | 8 |
| Ron Tichenor | 8 |
| Masanori Enomoto | 6 |
| Yohei Kojima | 6 |
| Kohji Ohkawara | 6 |
| Toshiki Tomita | 4 |
All-time Round Wins
- No data (1967-1994)
All-time Qualifying
| Kei Yamamoto | 18 |
| Akira Narita | 16 |
| Jay Wilson | 15 |
| Makoto Ogata | 12 |
| Toshiki Tomita | 8 |
| Yohei Kojima | 6 |
| Yoshitaka Atsuta | 5 |
| Chihiro Notsuka | 5 |
| Yu Hirata | 4 |
| Kainosuke Oshiro | 2 |
| Atsuki Uchida | 2 |
| Mitch Evans | 1 |
| Tim Gajser | 1 |
| Maximilian Nagl | 1 |
| Cole Seely | 1 |
All-time Qualifying
- No data (1967-2012)
