A Class	B Class	C Class	Special Class
AA			Women
80-200 CC	80-200 CC	80-200 CC	Jr. 12-14yrs (80-105cc)
201-250 CC	201-250 CC	201-250 CC	Jr. 12-16yrs (80- Opencc) (ages 13 & under are limited to 250cc by the AMA)
251-Open	251-Open	251-Open
Four Stroke	Four Stroke	Four Stroke	Senior B (40yrs+)
		Intermediate (30yrs+)	Senior C (40yrs+)
Veteran (35yrs+)			Senior Short A (45yrs+)
Senior (40yrs+)	Veteran (35yrs+)		Senior Short B (45yrs+)
			Super Senior A (50yrs+)
			Super Senior B (50yrs+)
			Masters A (58yrs+)
			Masters B (58yrs+)