Hot Stock Class Rules

Hot Stock Rules

This class is open to youngsters age 10 - 19 years of age. An exception may be made for 9 year olds with 3 years prior pulling experience in our Club and pass safety checks with Safety Tech Crew. This is a higher budget class, stock overhead valve V-twins and is open to single cylinder. 5200 RPM limit makes for an exciting ride down the track for more experienced pullers.
    1.  Class open to 1100 lb and 1200 lb hooks at Thundering Valley Raceway and at the fairs.
    2.  All tractors must use lawn mower type motor, 45.6 cubic inch  maximum V-twin or Single cylinder.

    3.  No fuel injection.

    4.  5200 rpm limit.  Motor must have stock governor installed.

    5.  Relocation of components allowed. 

    6.  Modifying of body panels allowed.

    7.  Bar lug tires allowed.  Tread may be modified.  No purpose built manufactured bar lug pulling tires allowed. 

    8.  No Pro pulling tires. No Dick Cepek, Lawntec, Pitbull, Vogel Manufacturing, or Nichols brand tires allowed.

    9.   52 1/2 inch wheel base maximum.

    10.  Tractors must have wheelie bars.

    11.  Tractor must have adjustable hitch with no less than 1 1/2 inch hole for hook.

    12.   All tractors must have rear mounted tether kill switch that must shut off ignition and electric fuel pump.

    13.  Flywheel must be covered 360 degrees.  

    14.  If you are running a stock flywheel for the make and model of the tractor, you cannot run over 4000 rpm's.

    15.   Over 4000 rpm shroud must be built according to Safety Rules, under 4000 rpm Stock shroud allowed.

    16.  All belts must be covered.

    17.  All tractors must have hood.

    18.  All tractors must have rear fenders.

    19.  No turbo's.

    20.  Tractor must use stock appearing rear end.

    21.  Motors must have stock carburetor, stock intake manifold, and stock heads for make/model of motor.  Carburetor maximum venturi size, 1 inch for single barrel carburetor, 22 mm venturi size for two barrel carb.  Venturi must be round in shape and choke plate must be installed in carburetor. 

    22.  Motors must retain stock stroke. 

    23. Only engine modification allowed is the changing of the flywheel and exhaust. No internal engine modifications allowed at all. Allowed to change external parts only. The engine must be stock per manufacture. No added external balancers allowed. No decking of block or heads. No porting or polishing allowed. STOCK ENGINE MEANS STOCK PERIOD. No overbuilding of small cube V-twins to reach class cubic inch limit, IE 18 HP V-twin must be left at 18 HP. If you want to use a 45.6 cubic inch engine you will need to purchase a 45.6 cubic inch engine. 
    24.  Single cylinders must retain stock valve train.

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