Sport Stock Class Rules

Sport Stock Single

This class is open to youngsters age 5 - 19 years old. This is a budget friendly class that is great for starters and is divided into two classes, single and twin engine. Stock tractors with bar lug tires and open exhaust brings a little more of a challenge than the Pure Stock Class. Jump in and give it a try!!

   1. Class open to 1100 lb and 1200 lb hooks at Thundering Valley Raceway and at the fairs.

   2. Motor limited to flathead single MAX 16hp or overhead valve single MAX 16hp, MOTOR MUST REMAIN STOCK.  NO MOTOR MODIFICATIONS ALLOWED. You must have the same type of motor that came in your tractor originally.

   3. Tractor must remain stock appearing.


   4. Must use stock flywheel.

   5. 4000 rpm limit.

   6. Open exhaust permitted.  Must exit vertically.

    7.  Turf tires or Bar lug tires allowed.  No cutting or modifying of tread.  No purpose built manufactured pulling bar lug tires allowed. Tires came new on lawnmower with proof that they came on that lawn mower and are not over 26x12x12.

    8.  No pro pulling tires.  No ATV type tires.   No Dick Cepek, Lawntec, Pitbull ,or Nichols brand tires.

    9.  Tractor must have wheelie bars.

   10.  All tractors must have adjustable hitch on rear with no less than 1 1/2 inch hole for hook.

   11.  All tractors must have rear fenders.

   12.  All tractors must have hood.

   13.  All belts must be covered.

   14.  All tractors must have stock appearing rear end.

   15. Changing of clutch is allowed. 

   16. 30 thousandths allowed on motor rebuild. You may bore cylinder  and machine head. 

  17. Relocation of components allowed. 

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