SECTION 1.2 MOTOCROSS EQUIPMENT
Special Note: The American Motorcyclist Association doesn't inspect vehicles in AMA-sanctioned competition. Participants are solely responsible for the condition of their vehicles and their competence to operate them.
A. Approval of Motorcycles/Minicycles
1. Next year model machines are not eligible in any class at the AMA Amateur National Motocross Championships.
2. 0-112cc 2-stroke/150cc 4-stroke Limited Class
a. To be approved for AMA-sanctioned competition, minicycles (engines and frames) must be available through retail distributors.
b. For a minicycle to be homologated, the manufacturer must apply to the AMA, register the machine's specifications, provide photographs, OEM parts list, provide 10 identical machines of the same year and model for AMA Inspection and an additional 65 identical machines of the same year and model are manufactured and available for sale to the general public through a distributor network by April 15th of the current model year.
c. Manufacturers and distributors must have a sufficient quantity of spare parts to meet customer demand for a minimum of the current model year being approved.
d. Superseded or redesigned parts must be submitted to AMA Racing for review and approval before their use in competition. These parts must be listed in the current OEM parts list supplied to AMA Racing.
e. The AMA may require one unit of each approved model and/or superseded or redesigned part(s) to be provided for long-term parts comparison.
f. Only after the homologation paperwork has been verified and approved by AMA Racing will the minicycle be added to the approved for AMA competition list.
g. Homologation will last until such time as the motorcycle no longer conforms to the current limited class rules.
h. Homologation is required each year for new models even if that model hasn't changed from the previous year homologation.
i. AMA Racing will provide a list of homologated minicycles. This list may be updated at any time.
j. If at any time it is discovered that the manufacturer hasn't met the requirements or falsified any information during the homologation process, the manufacturer may be fined up to $10,000 and may
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be placed on probation or suspension from AMA competition for up to five years.
k. Minicycles will be approved at the sole discretion of AMA Racing.
3. 113cc 2-stroke/151 4-stroke and up Limited Class
a. To be approved for AMA-sanctioned competition, motorcycles (engines and frames) must be available through retail distributors.
b. A new manufacturer may be required to complete an approval application on initial request for approval for a new model or any time the AMA deems necessary.
c. Motorcycles will be approved at the sole discretion of AMA Racing.
B. Limited Class Equipment Standards
1. To be eligible for a LIMITED CLASS, the following ARE NOT PERMITTED to be changed or modified:
Air Box
Air Box Vent Tube
Air Filter Screen
Air Intake Boot
Axle
Brake Rotor Size (thickness/diameter)
Brake Master Cylinder
Carburetor (including any parts with exception to jets) Clutch (any part including clutch cover) 2
Crankshaft Stroke Length
Cylinder Bore Size 1
EFI Throttle Body 5
Electronics 5
Exhaust Control Valve (ECV)
Exhaust Pipe (any part)
Frame 3
Front Forks 4
Front Fork Caps
Intake Spacer
Internal Engine Components (blue printing is not allowed) 2 Lower Triple Clamp
Oil Injection System (only oil may be in system) 6
Rear Shock 4
Reed Valve Assembly (any part)
Rim Size
Silencer (tip may be modified to accept spark arrestor) Subframe 3
Swingarm 3
Transmission (any internal part)
Yamaha PW50 Start/Run/Off Switch
Water Pump Assembly (any part except the cover) Wheel Hubs
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MOTOCROSS 1.2
2. To be eligible for the LIMITED CLASS, the following ARE NOT PERMITTED to be added:
Adjustable Leak Jet
Bark Busters (closed end or wrap-around metal hand guards) Fork Brace
Radiator Fan
3. The following notes are exceptions to the items listed above:
a. 1 Cylinder re-plating is allowed by the original manufacturer’s bore must be retained.
b. 2 Clutch plates, pistons, and piston rings may be aftermarket as long as they maintain the stock shape, design, and material of the OEM parts. High compression pistons are not allowed.
c. 3 Material may be added to the production frame or swingarm for strength, including welding. These changes shall not affect frame geometry.
d. 4 OEM front and rear suspension can be altered with internal modifications only. Shock linkage and suspension spring rates may be changed to any commercially available part.
e. 5 Programming or mapping changes to the stock OEM ECU unit are permitted.
f. 6 To be eligible for limited classes that use oil- injection systems, the system must be fully functional and only oil may be put in the reservoir. Pre-mix gasoline is not allowed in the oil-injection system.