Rules - General Equipment
Lights - Headlight, taillight, and turn signals must be removed. Tape may not be used.
 
Number Plates - Number plates are an important part of racing; they help the scorers correctly identify riders. Numbers that are too small or difficult to read increase the risk of scoring issues. Number plates must adhere to the specifications described in the AMA Sports Rules, Chapter 3, Section C.15.
 
Number plates or number display areas must be of adequate area to provide ample space (approximately 1") around and between numbers. They should be white with black numbers, black with white numbers for SMX250/Pro Lites, current champions may run the 1 plate, and points leaders may run red plates.
 
Tires - Tires permitted in competition must meet the following criteria (unless otherwise specified by class requirements):
(1) Class "C" dirt-track tires
(2) Road-race slicks
(3) Cut road-race slicks
(4) Road-race rain tires
(5) Any DOT tire
Knobby Tires are prohibited. The race referee reserves the right to impound tires at anytime during a meet for whatever inspection and/or testing it deems necessary.
 
Fluid Containment - Oil filter bolts must be secured with safety wire. Spin-on oil filters must be secured with metal clamps and safety wire.
Oil filler caps and oil lines must be safety wired, or secured by an approved method.
All machines must have a catch device attached and will have the carburetor overflow/vent lines running into it. The crankcase breather lines are also required unless the lines are vented to the air box. The vent lines coming out of the engine must be routed into a heat-resistant catch device of at least 177 mL (6 ounces) capacity that is not made from a drink container.
 
Rules - Competition Apparel
The following apparel must be worn by riders in ALL events.
 
Helmet, boots, and face shield / goggles are required as described in the AMA Sports Rules, Chapter 3, Section E.
 
Riders must wear helmets at all times when riding on the course.
 
Gloves may be made of leather or other protective material and must be worn while the motorcycle is on the racetrack.
 
Riding Suit
(1) One-piece or two-piece (upper and lower pieces must be securely attached together) riding suit made of leather or Kevlar are highly recommended.
(2) Riders may use commercially manufactured motocross jerseys and pants provided they are constructed with, or used in conjunction with, elbow pads, knee cups and hip pads. A commercially manufactured chest/back protector must be worn with motocross apparel.  
 
Rules - Bike Tech - Quick Notes
- 5 or 6 inch black numbers on white back ground. No electrical tape.

- Crank case and radiator breather and overflow must go in catch tank, sealed air box permitted.

- Radiator must run water or non-damaging track coolant.

- Safety wire - Drain plug, oil filler, radiator cap, coolant drain, caliper mounting bolts, and chain master link
 
Rules - Classes
Premier Mini-Moto: A or B level rider on single cylinder machines with a maximum displacement of 110cc (2-stroke) or up to198cc (4-stroke), otherwise unlimited modifications, with the exception that they must maintain a mini chassis. Maximum wheel diameter, 19" front, 17" rear. Minimum wheel diameter 16" front, 14" back. Minimum age 12. The only exception is that riders under 12 may enter with 5 years or more of racing experience.
 
Air Cooled: A, B, or C level rider on single cylinder machines with a maximum displacement of up to 158cc (air cooled 4-stroke only), otherwise unlimited modifications, with the exception that they must maintain a mini chassis. Maximum wheel diameter, 19" front, 17" rear or minimum size no smaller than stock. Minimum age 12. The only exception is that riders under 12 may enter with 5 years or more of racing experience. XR100 Cup May Bump to Premier Mini.
 
XR100 Cup: A, B, or C level rider on and XR/CRF 100 machine with a maximum displacement of 132cc (4-stroke). Original crankcase, head, and original stroke. Modifications are allowed to stock air box, suspension, chassis, exhaust, tires, gearing, jetting, handlebars, hand guards (non-metal, open-ended are recommended), levers, grips and cosmetics, and after-market brake pads may be used. Minimum age 9.

Big Bike Classes
Novice: C level rider, unlimited displacement single or twin-cylinder machines with unlimited modifications. Minimum age 16. You may bump to Open AM
 
45+: B or C level rider, unlimited displacement single or twin-cylinder machines with unlimited modifications. Minimum age 45.
 
Super Biker (2 Stroke): A,B,C level rider, unlimited displacement single or twin-cylinder 2 stroke machines with unlimited modifications. Minumum displacement of 125cc. Minimum age 16.
 
Open AM: B level rider, unlimited displacement single or twin-cylinder machines with unlimited modifications. Minimum age 16. You may bump to SMX at race directors discretion.
 
SMX 250: A level rider. Single cylinder machines of 250cc 4 stroke liquid cooled or 125cc 2 stroke liquid cooled. Minumum displacement of 199cc (4stroke). Minimum age 16. You can only register for SMX classes.
 
SMX Open: A level rider, unlimited displacement single or twin-cylinder machines with unlimited modifications. Minumum displacement of 439cc. Minimum age 16. You can only register for SMX classes.

 
There is no dirt section for the following classes
SuperMono: A,B,C level rider, unlimited displacement single or twin-cylinder machines with unlimited modifications. Minumum displacement of 199cc. Minimum age 16. This is non dirt class
 
Open Pit Bike: A, B, or C level rider on single cylinder machines with a maximum displacement of 85cc (2-stroke) and 158cc (4-stroke), otherwise unlimited modifications. Maximum wheel diameter is 14 inches and the minimum size no smaller than stock. Modifications are allowed to stock air box, suspension, chassis, exhaust, tires, crank cylinders, gearing, jetting, handlebars, hand guards (non-metal, open-ended are recommended), levers, grips and cosmetics, and after-market brake pads may be used. Minimum age 12. Stock wheel sized XR/CRF80s may run the class.
 
GP80: A, or B level rider on single cylinder machines with a maximum displacement of 110cc (2-stroke) or up to 158cc (4-stroke), otherwise unlimited modifications. Minimum age 12. The only exception is that riders under 12 may enter with 5 years or more of racing experience.
 
GP50: A, B, or C level rider on single cylinder machines with a maximum displacement of 65cc (2-stroke) or up to 125cc (4-stroke - TTRs excluded), otherwise unlimited modifications. Minimum age 12. The only exception is that riders under 12 may enter with 5 years or more of racing experience.
 

Rules based on original - AMA Rules