Factory Stock Rules: 
1. RPM limited to Stock Factory high idle + or – 2%. Must have positive throttle stop. No use of vise grips for stop.
2. **3.5 MPH SPEED LIMIT**
3. Wheel diameter must be stock. Tire size must not exceed class limits. No cut, grooved or radial tires.
4. **Front and rear wheels weights must be O.E.M. type for that model tractor.**
5. Tractor must have factory PTO or factory belt pulley.
6. Tractor must run on fuel it was originally equipped for. No high octane gasoline.
7. Must have stock block, crankcase, head, manifolds, carburetor, exhaust and air cleaner for that model tractor.
8. **No pulling hitches allowed, must have stock draw bar in stock mounting position and provide your own 3 inch clevis.**
9. Wheel Weight can not be hung on frame of any model tractor.

Hobby Stock Rules:
1. RPM limited to 10% over stock – Positive throttle stops mandatory.
2. 6 mph speed limit. Tractors with creeper gear can use second gear.
3. Wheel diameter must be stock. Tire size must not exceed class limits. No cut, grooved tires.
4. No aluminum frame or chassis components. Any non-aluminum rear wheels allowed.
5. Tractor must run on fuel type for which it was originally equipped.
6. Must have stock block, crankcase, head, manifolds, and carburetor for that model tractor.
7. Hitch must be rigid in all directions. No pulling from two or three point hitches. Pulling hitches allowed.

Open Rules:
1. No RPM limit.
2. May use any gear.
3. No fuel injection or multiple fuel systems allowed unless installed by original tractor mfg.
4. Engine block and crankcase must be same length, height, number of cylinders, and make as stock.
5. Hitch must be rigid in all directions. No pulling from two or three point hitches. Pulling hitches allowed.
6. No nitrous oxide allowed.
7. No turbo unless made for tractor from factory.

9500 Improved Stock Diesel Class Turbocharged Rules
1. Speed limit 10 mph.
2. One fuel only gas or diesel.
3. Stock appearing engine and sheet metal, transmission and rear end must match brand.
4. Stock appearing carburetor and fuel pump.
5. Engine block must be from a 410 cubic inch or smaller diesel or gas engine.
6. Single turbo allowed with up to a 2.25 in. max intake to 4 turbocharger.
7. No inline fuel injection pumps allowed in this class.
8. No V or double cut tires.
9. Tractor must have wheelie bars, wide front.
10. Protest rules.
11. No slug or slot allowed.
12. You can use water injection of any kind/no inner cooler.

Factory Farm Classic Class 12,500 1960 – 1970
1. Speed limit 10 mph.
2. One Fuel only diesel or gas.
3. Tractor must have factory PTO.
4. Tractor must have stock block, crankcase, head, manifold, exhaust and air cleaner for model tractor.
5. No V or double cut grooved tires.
6. Front and rear wheels weight must be O.E.M. type for that model tractor.
7. **DUALS** are allowed.
8. Tractor must run on fuel it was originally equiped with.
9. Provide your own 3 inch clevis.