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{{Main|AMA Motocross Championship}} | {{Main|AMA Motocross Championship}} | ||
The AMA Motocross Championship (the "outdoor series") season begins in early May and continues until mid-September, and consists of twelve rounds at twelve major tracks all over the continental | The AMA Motocross Championship (the "outdoor series") season begins in early May and continues until mid-September, and consists of twelve rounds at twelve major tracks all over the continental United States. There are two classes:<ref>{{cite web | url= http://admin.amaproracing.com/assets/MX_Rules_2009.pdf | format= PDF | title= Motorcross Rule Book | publisher= AMA | accessdate= 15 March 2010}}</ref> the 250 Motocross Class for 0–125 cc 2-stroke or 150–250 cc 4-stroke machines; and the 450 Motocross Class for 150–250 cc 2-stroke or 251–450 cc 4-stroke machines. Each round has two motos of thirty minutes plus two laps. | ||
===Motocross des Nations=== | ===Motocross des Nations=== |