AMA U-S- Motocross Nationals - 1990 was released on: USA: 25 March 1990
AMA United States Motocross Nationals - 1990 was released on: USA: 25 March 1990
$100,000,000
1762
Chris Shipclark was number 8 in Canada in the 1990-1991 Motocross series
Don't know about a total for the year but this is from Motocross Action mag, In 2008 James made at least $2,236,000 during the 12 AMA Nationals.
1902
you go to WWW.addictinggames.com
Montreal
1947
No, acutally your supposed to start when your small but if you want to do motocross get a 250 2 stroke or a 450 4 stroke and compete in National races and get sponsored.
The AMA was formed in 1924 but it wasn't until 1969 before the AMA ran its first professional motocross race.