General

 

1. Tractors are to be of chassis 1968 and older.
2. Any gear, any speed, shifting of T/A’s, Power Directors, Multi-Powers, or like transmissions allowed.
3. All rules and oversights will be interpreted by the IAMO Board of Directors with all finding and rulings being final.

 

Weight

 

1. 5,800 lbs.

 

Engine

 

1. All tractors must be naturally aspirated.  NO blowers, turbochargers, or superchargers are allowed.
2. A 350 cubic inch limit applies to all 6 cylinder engines with a 385 cubic inch limit for all four cylinder engines.
3. Engines must have stock appearing blocks and heads to match the make of the tractor.
4. NO aluminum or aftermarket manufactured heads allowed.
5. Any integral plates, girdles, or reinforcement devices that enhance the engine’s rigidity and improve safety will be allowed.  Deck plates can be no thicker than 1”.  Girdles can be no thicker than 1” material.  Spacer plates can be no more than 2” combined.
6. All tractors must be equipped with a steel flywheel.
7. Head and pan measurements to be made for cubic inch establishment prior to the start of the season.  Head must be visible for viewing.  Block casting and serial #’s will be recorded for future checks.

 

Tires

 

1. Maximum tire size is 18.4x38 or equal footprint.  NO radial tires. No duals.  Any cut allowed.  Any rim width.

 

Hitch and Chassis

 

1. Weights must not extend rearward beyond the tires and cannot be more than 13’ from the center of the rear axle to the furthest part forward.
2. Drawbar must not exceed 20” in height or be shorter than 18” from the center of the rear axle to the hood point.  Drawbars must be stationary in all directions.

 

Safety

 

1. Drivers must remain seated at all times.  
2. Drivers must wear a fire suit and helmet
3. All tractors must be equipped with a fire extinguisher within reach of the driver at all times.
4. Tractors must be equipped with “Dead Man” style throttle.
5. All exhaust must exit straight up with no curves or bends.
6. All tractors must have a working safety kill switch.
7. All tractors will have a 3/8” steel band/plate covering the flywheel area or an approved scatter safety blanket.
8. Wheelie bars are required.
9. All tractors must run rear fenders.  Fenders must be as tall as the rear tires.
10. Tractors must be equipped with an appropriate roll over protection device.  It may be OEM style or a multi-bar cage design.
11. All tractors shall be equipped with tie bars.
12. Drivers under the age of 18 must have a written consent form on file with the IAMO Board of Directors.  This form must be submitted and signed by the parent or legal guardian of the driver in question.
13. NEW FOR 2010: All tractors must be equipped with front stabilizer bars or skis. The lower most portion of the bar must be no higher than 4" off the ground.