To Start:

Mower is open to all self-propelled rotary or reel style riding lawn mower.
The mower must have been sold commercially to mow lawns.
The mower must be in originally design.
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Inspection:
The mower that is entered into any USLMRA event must be approved by Technical Inspection.
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The mower:
Cutting blades MUST be removed completely off your mower.
You must install a safety cut off switch.
Brakes must be in good working condition, and operate on at least two wheels.
Non Stock mowers must have an automatic throttle closing device.
Only use pump gas. 
Only additive allowed: STA BIL Fuel Stabilizer.

Safety:
All drivers must wear a racing safety or motorcycle safety  helmet approved by DOT or SNELL.
All  must wear a long sleeve shirt, long pants, gloves, Goggles or face shield and boots.
All drivers, and this is mandatory, must wear an "approved for racing" neck support.

Classes:  See Rules on USLMRA for full information on classes.
Stock Class: This is a mower delivered from the factory with blades removed.
JP Class: This class is for ages 10-15. Parent or legal guardian must be present. Full size mower, front engine, stamped steel frame. Governed engine. 
IMOW Class: Front engine, highly regulated.
AP, GP, SP, CP, BP, GPK: These mower are as delivered from the factory except for the modifications listed in Rules on the USLMRA site. 
FX Class: Major modifications allowed on these mowers.