AMA Motocross Championship
The AMA Motocross Championship is the major motocross series of the United States, held since 1972. It is sanctioned by the American Motorcyclist Association and managed by MX Sports Pro Racing.
The series began in 1972 with the introduction of two classes based on 500 cc and 250 cc engine formulas.[1] A 125 cc class was added in 1974. As motocross technology developed, 500 cc two-stroke motocross bikes became too powerful for the average rider and, faced with diminishing numbers of competitors, the A.M.A. discontinued the 500 cc class after the 1993 season. A women's national championship series was introduced in 1996.[2]
Facing tightening emissions regulations, in 1997, the A.M.A. increased the allowable displacement capacity for four-stroke engines, in an effort to encourage manufacturers to develop environmentally friendlier four-stroke machines.[3] In 2006, the 250 cc division was renamed the MX Class, with an engine formula allowing for 150–250 cc two-stroke or 250–450 cc four-stroke machines.[4] The 125 cc class was renamed the MX Lites Class, allowing 0–125 cc two-stroke or 150–250 cc four-stroke engines. In 2009, the MX class was renamed the 450 Class and the MX Lites class was renamed the 250 Class, to reflect the fact that all the competing manufacturers had adopted four-stroke machinery.
National Champions
Year | 500cc | 250cc | 125cc |
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1972 | ![]() |
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1973 | ![]() |
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1974 | ![]() |
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1975 | ![]() |
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1976 | ![]() |
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1977 | ![]() |
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1978 | ![]() |
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1979 | ![]() |
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1980 | ![]() |
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1981 | ![]() |
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1982 | ![]() |
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1983 | ![]() |
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1984 | ![]() |
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1985 | ![]() |
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1986 | ![]() |
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1987 | ![]() |
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1988 | ![]() |
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1989 | ![]() |
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1990 | ![]() |
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1991 | ![]() |
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1992 | ![]() |
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1993 | ![]() |
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Year | 250cc | 125cc | Women's MX |
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1994 | ![]() |
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1995 | ![]() |
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1996 | ![]() |
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1997 | ![]() |
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1998 | ![]() |
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1999 | ![]() |
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2000 | ![]() |
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2001 | ![]() |
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2002 | ![]() |
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2003 | ![]() |
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2004 | ![]() |
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2005 | ![]() |
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Year | MX Class | MX Lites Class | Women's MX |
2006 | ![]() |
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2007 | ![]() |
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2008 | ![]() |
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Year | 450 Class | 250 Class | Women's MX |
2009 | ![]() |
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2010 | ![]() |
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2011 | ![]() |
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2012 | ![]() |
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See also
References
- ^ The First Sixty Years: An Illustrated History of the American Motorcyclist Association. Books.Google.com. January 1984. Retrieved 2 October 2010.
{{cite book}}
:|work=
ignored (help) - ^ a b "Women's Motocross National". Women's Motocross Association. Retrieved 2 October 2010.
- ^ Counting Strokes. Books.Google.com. June 1997. Retrieved 2 October 2010.
{{cite book}}
:|work=
ignored (help) - ^ "Motocross Rule Book" (PDF). AMA. Retrieved 15 March 2010.
- ^ AMA Motocross Champions. Books.Google.com. February 1986. Retrieved 2 October 2010.
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ignored (help) - ^ "Every Champ There Ever Was". Motocross Action. Archived from the original on 25 October 2010. Retrieved 2 October 2010.
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External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)