Mid America Motocross Series Classes
Class
Number
1
2
3
4
All Stock
Classes
Class
PeeWee Jr
STOCK
PeeWee Sr.
STOCK
PeeWee STOCK
This is AMA
Class # 4
PeeWee Open
Stock
Age
Requirements
4-6 Years Old
7-8 Years Old
Engine
Size/Type
0cc – 51cc 2 or 4
Stroke
0cc – 51cc 2 or 4
Stroke
4-8 Years Old
0cc – 51cc 2 or 4
Stroke
4-8 Years Old
0cc – 51cc 2 or 4
Stroke
Notes
Single-speed automatic. Maximum wheelbase 36 inches.
Maximum wheel size 10 inches. Maximum seat height 24
inches. No larger than 14mm round intake.
Single-speed automatic. Maximum wheelbase 41 inches.
Maximum wheel size 12 inches. Retrofitted 12-inch wheels
are permitted on all class 2 motorcycles. OEM parts must
be used. No larger than 19mm round intake.
Single or multi-speed automatic. Maximum wheelbase 38
inches. Maximum wheel size 10 inches. Maximum seat
height 22 inches. No larger than 13mm round intake.
Single or multi-speed automatic. Maximum wheelbase 38
inches. Maximum wheel size 10 inches. Maximum seat
height 22 inches. No larger than 13mm round intake.
All carburetors are to be original equipment. The intake side of the cylinder/output side of the carburetor must have an opening no
larger than the above-mentioned size for that class. The opening must be a round opening. An oval shaped opening is NOT
acceptable. The restriction must be a minimum of 4mm thick. The hole must have square corners (no radius of chamfer on either side).
Seat height will be measured at the lowest part of the top of the seat.
Wheelbase: The length of a horizontal line connecting two vertical lines drawn
from the center point of each axle to the surface, with the rear axle adjusted to its
maximum rearward position. Wheelbase shall be measured with the machine in an
upright unloaded position.
*Minimum wheel size 12 inches. Maximum front wheel
59cc – 65cc
14 inches. Maximum (adjusted length) wheelbase 45
2 Stroke
inches.
Maximum wheelbase must maintain manufacturer
specifications.
Maximum front wheel 17 inches. Minimum rear wheel 12
79cc – 85cc
inches.
2 Stroke
Maximum rear wheel 16 inches. Maximum wheelbase 51
inches.
Maximum wheelbase 52 inches. Maximum front wheel size
79cc – 85cc
19 inches. Maximum rear wheel size 16 inches.
5
No 65 Sr
6
65cc Jr
7-9
65cc Open
7 - 11
7
85cc Jr
9 - 11
8
Super Jr
9 - 11
9
Girls
9 -15
10
Youth Beginner
9 – 16
(Non Points)
11
85 Sr/Mini Sr
12 - 14
12
Super Mini
Thru - 16
13
Schoolboy 1
(B/C)
12 - 16
14
14 -16
15
Schoolboy 2
(B/C)
125cc (B/C)
16
Women
12 +
122cc – 125cc 2
Stroke Only
99cc – 250cc
17
18
College (B/C)
2 Stroke Open
14 - 24
16 +
122cc - Open
122cc - Open
12 +
2 Stroke
79cc – 85cc
2 Stroke
79cc – 112cc 2
Stroke/75cc
150cc 4 Stroke
79cc – 85cc 2
Stroke/ 75cc150cc 4 Stroke
79cc – 112cc 2
Stroke/75cc
150cc 4 Stroke
86cc – 125cc 2
Stroke/75cc –
150cc 4 Stroke
122cc – 250cc
Maximum front wheel 17 inches. Minimum rear wheel 12
inches.
Maximum rear wheel 16 inches. Maximum wheelbase 51
inches.
Must be 12 years of age or older to ride anything
bigger than an 85cc.
Maximum wheelbase 52 inches. Maximum front wheel size
19 inches. Maximum rear wheel size 16 inches.
Max. Wheels: Front 17”; rear 14”
Max. Wheelbase: 51”
Maximum wheelbase 52 inches. Maximum front wheel size
19 inches. Maximum rear wheel size 16 inches.
Minimum front wheel size 19 inches. Minimum rear wheel
size 16 inches.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum front wheel size 19 inches. Minimum rear wheel
size 16 inches.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Mid America Motocross Series Classes
Class
Number
19
20
21
22
23
23.1
24
25
Class
Engine
Size/Type
122cc - Open
122cc – 250cc
122cc – 250cc
122cc – 250cc
122cc – Open
122cc – 250cc
122cc – Open
122cc – Open
Notes
Adult Beginner
250 C
250 B
250 A
Open C
Open C
Open B
Open A
Age
Requirements
14 + (Non Points)
14 +
14 +
14 +
14 +
21 +
14 +
14 +
Class
Number
26
27
28
29
30
31
32
Class
Payout
Notes
25 Plus
30 Plus
30 Plus
80% Minimum
Trophy
80% Minimum
Engine
Size/Type
122cc – Open
122cc – Open
122cc – Open
40 Plus
50% Minimum
122cc – Open
Minimum wheelbase 53 inches. No minicycle or Supermini.
50 Plus
50% Minimum
122cc – Open
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.
Minimum wheelbase 53 inches. No minicycle or Supermini.