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    • Home
    • Club members
    • Rule Book
      • List of Classes
      • Operation of contest
      • Yearly Fees
      • points system
      • General Track Rules
      • flag person
      • General Tractor rules
      • Reason 4 Disqualification
      • teardown
      • stock class
      • stock 25 hp twin
      • mod stock/stock altered
      • pro stock
      • flat head Classic s.s.
      • open super stock
      • p.s.t.
      • Heavy Super Mod. 1300lb
      • Lite Super Mod 1100lbs
      • Outlaw 1200lb
      • 250CC Midget outlaw 750lb
      • limited outlaw 1500lb
      • unlimited outlaw 1500lb
      • sleds
      • board of directors
      • Tear Down & Safety techs
    • Schedule
      • Calendar
      • Schedule
    • POINTS
      • 2021 Points
      • 2022 points
      • 2023 points
      • 2024 Points
      • 2025 Points
    • Printable Rule Book 2025
American Mini Pullers INC
  • Home
  • Club members
  • Rule Book
    • List of Classes
    • Operation of contest
    • Yearly Fees
    • points system
    • General Track Rules
    • flag person
    • General Tractor rules
    • Reason 4 Disqualification
    • teardown
    • stock class
    • stock 25 hp twin
    • mod stock/stock altered
    • pro stock
    • flat head Classic s.s.
    • open super stock
    • p.s.t.
    • Heavy Super Mod. 1300lb
    • Lite Super Mod 1100lbs
    • Outlaw 1200lb
    • 250CC Midget outlaw 750lb
    • limited outlaw 1500lb
    • unlimited outlaw 1500lb
    • sleds
    • board of directors
    • Tear Down & Safety techs
  • Schedule
    • Calendar
    • Schedule
  • POINTS
    • 2021 Points
    • 2022 points
    • 2023 points
    • 2024 Points
    • 2025 Points
  • Printable Rule Book 2025

Mod Stock/Stock Altered:

1. All general rules apply. 


2. Engines may be bored .030 overstock. 


3. Stock stroke 


4. Cams: 

   A. 8hp Mod Stock - .324 inches of lift 223 degrees of duration. Mod Stock Only

   B.  10-16 hp .330 inches of lift. 


5. Must have a steel flywheel. 


6. Stock appearing carburetor (1.200 maximum) 


7. Kohler block must maintain a cast iron intake runner. 


8. Maximum one inch carburetor standoff or ram tube. 


9. Single cylinder, flat head, four stroke, must maintain factory deck height. Stock crank, cam, Valve and valve locations. 


10. Heads:

    A. 8hp Mod Stock – any head. Mod Stock Only 

    B. 10-16hp – May have any head. 


11. Shielding: 1/8 inch steel ¼ inch aluminum. Shielding will run from the bottom of the cylinder to the bottom of the crankcase on both sides. On the front and rear on cross mounted motors. Shields must be bolted to the frame. 


12. Tires not to exceed 26x12x12. 


13. Stock appearing fin block. 


14. No external modification to the block, must maintain factory appearance. 


15. All heads must be strapped with a permanently mounted metal bar.  


16. Must be 10yrs of age subject to AMPI board discretion.

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