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STOCK CLASS (13hp)
13 Horsepower and under
Class 1: 950 pounds
Class 2: 1050 pounds
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STOCK CLASS (14-16hp)
14-16 Horsepower
Class 1: 1000 pounds
Class 2: 1050 pounds
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STOCK TWIN
25 Horsepower and under
Class 1: 1000 pounds
Class 2: 1100 pounds
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MODIFIED TWIN
25 Horsepower and under
Class 1: 1050 pounds
Class 2: 1100 pounds
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PRO STOCK SINGLE
50.5 Cubic Inch and under
Class 1: 1050 pounds
Class 2: 1100 pounds
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PRO V-TWIN
70 Cubic Inch
Class 1: 1050 pounds
Class 2: 1100 pounds
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YOUTH STOCK CLASS
13 Horsepower and under
Class 1: 900 pounds
Class 2: 950 pounds
13 years of age and under
at the start of the pulling season
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OPEN
Up to 4-cycle, non-automotive
Class 1: 1150 pounds
Class 2: 1200 pounds
72-inch Wheelbase
Tire Size 26 x 12 x 12
13 inch hitch height
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STOCK
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STOCK TWINS
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MODIFIED TWIN
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PRO STOCK SINGLES / V-TWINS
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RPM
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4200
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4200
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Unlimited
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Unlimited
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TIRES
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23 x 10.50 x 12 max
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23 x 10.50 x 12 max
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26 x 12 x 12 max
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26 x 12 x 12 max
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TIRES TYPE
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Turf or Bar
(May Be Cut)
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Turf or Bar
(May Be Cut)
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Professional
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Professional
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HITCH HEIGHT
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13"
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13"
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13"
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13"
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WHEELS
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Aluminum Permitted
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Aluminum Permitted
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Aluminum Permitted
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Aluminum Permitted
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HOUSINGS
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No Aluminum
Unless Factory
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No Aluminum
Unless Factory
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Aluminum Permitted
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Aluminum Permitted
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FRAMES
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Factory
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Factory
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Factory
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Factory
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WHEEL BASE
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Altered Up To 6"
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Altered Up To 6"
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Altered Up To 6"
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56"
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CRANKSHAFT
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Stock
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Stock
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Stock
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Factory
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BORE
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.030 Over Max
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.030 Over Max
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.030 Over Max
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50.5 cu. in. (Single)
70 cu. in. (Twin)
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PISTON
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Stock Must Be Flush
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Stock Must Be Flush
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Stock Must Be Flush
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.
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Any
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CAMSHAFT
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Stock No Tampering
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Stock No Tampering
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Cast/Non Adj. Stock Lift
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Any
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VALVES
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Stock
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Stock
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Stock
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Any
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CARBURATOR
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Stock 1" Venturi Max
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Stock Per Model
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Stock Per Model
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1.2 Venturi Max
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CARB SPACER
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None
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None
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None
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1" Max
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IGNITION
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Stock
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Stock
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Stock
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Any
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REAR ENDS
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Tractor Type
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Tractor Type
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Tractor Type
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Tractor Type
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EXHAUST
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Straight Pipe 90 Degrees
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Straight Pipe 90 Degrees
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Straight Pipe 90 Degrees
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Straight Pipe 90 Degrees
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HEADS
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Stock No Alterations
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Stock No Alterations
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Stock or
Port & Polish
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Stock or Billet Permitted
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HEAD PLATE
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No
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No
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No
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Yes
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SHEILDS
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Yes
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Yes
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Yes
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Yes
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FENDERS
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Yes
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Yes
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Yes
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Yes
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BLOCKS
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Stock No Alterations
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Stock No Alterations
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Stock or Port & Polish
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Recast Ok
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FLYWHEEL
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Stock No Steel
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Stock No Steel
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Must Be Steel
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Must Be Steel
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BRAKE/REVERSE
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Yes
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Yes
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Yes
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Must Have Brakes
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FUEL PUMP
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Electric OK
Must be Advanced Auto Parts # 12-S, NAPA#610-1050, or Auto Zone # E80125.
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Electric OK
Must be Advanced Auto Parts # 12-S, NAPA#610-1050, or Auto Zone # E80125.
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Electric OK
Must be Advanced Auto Parts # 12-S, NAPA#610-1050, or Auto Zone # E80125.
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Any Electric Fuel Pump
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EXT. CRANK WEIGHT
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No
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No
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Permitted
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Permitted
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GOVENOR
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OEM Unaltered
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OEM Unaltered
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N/A
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N/A
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