Championship
Class Definitions
Vintage 125,
250 & 500
1974
and earlier with no more than 7 inches of travel in the front
and 4 in the rear.
Note: Modified frames and after market swingarms are OK provided
they meet the maximum travel requirements. 1974
like design machines are eligible (i.e. 1975 CR125, KX125, TM125,
YZ125)
Evolution 125, 250 and 500
1975
and later machines, originally built with air cooled engines,
drum brakes and no linkage suspension. Note:
Yamaha monoshock models are eligible up to 1981.
Vintage 40+
and 50+
Any
displacement Vintage machine, as described above is eligible.
Note: 50+ age riders can enter 40+ class.
Evolution 40+ and 50+
Any
displacement Evolution machine, as described above is eligible.
Note: 50+ riders can enter the 40+ class.
Standard
Skill Levels - Expert, Intermediate, Amateur (also called Novice
)
Numbers-
All machines must have the same numbers on all three number
plates. Number must be at least 6 inches tall and contrasting
to the number plate background (i.e. No black numbers on green
backgrounds please)
125 (up to 125cc) 
