Unlimited AllStars

4412 W. 6th Ave.

Beaver Falls, PA 15010
(724) 462-7440

Exec Director: Mark Bergfelt


1. Engines-Minimum Weight/Maximum Displacement


  1. Rotary Valve and Reed Valve Two Stroke Engine or Engines:

    1. Maximum displacement is 275 cc

      1. Single cylinder 'Small' engines

200lbs plus one pound per cc or fraction of cc. Maximum small single engine displacement is 199 cc.

      1. Large displacement engines

        200 cc to maximum allowable.

                                        200 cc – 255 cc = 400lbs

                                        256 cc – 275 cc = 430lbs

      1. Multiple engine

            200lbs plus one pound per cc or fraction of cc.

            Multiple engines 230 cc – 275 cc must weight 430lbs

   ********* Common Case Multiple Cylinders Engines ARE NOT Legal*********************


  1. Flat Head Four Stroke Cycle Engine or Engines:

    1. Maximum displacement is 500 cc

    2. 190lbs plus one pound for every 3cc or fraction of a cc. Multiple engines or cylinders are permissible. 500 cc maximum total displacement.

    3.  single cylinder single engine from up to 500 cc is allowed but the kart must weight 430lbs.

    4. A 10 cc overbore is allowed in tech.


  1. Piston Port Two Stroke Cycle Engine:

    1. Maximum displacement is 305 cc

    2. 130lbs plus one pound for every cc or fraction of a cc. Multiple engines are permissible.

    3. 430lbs is the maximum required weight.

********* Common Case Multiple Cylinders Engines ARE NOT Legal*********************

  1. Overhead Cam (OHC) Four Stroke Cycle Engine:

    1. Maximum displacement is 500 cc for a single cylinder engine. 205lbs plus one pound for every 2cc or fraction of a cc. 450 cc – 500cc = 430lbs

    2. Multiple engines or cylinders are permissible up to a 500 cc total displacement. Maximum required weight is 430lbs.

    3. A 10 cc overbore is allowed in tech.


  1. Overhead Valve Pushrod (OHV) Four Stroke Cycle Engine:

    1. 200lbs plus one pound for every 2.5cc or fraction of a cc. Multiple engines or cylinders are permissible with a 500cc maximum total displacement.

    2. A single cylinder single engine up to 500cc is allowed but must weight 430lbs.

    3. A 10 cc overbore is allowed in tech.

  1. Single Rotor Rotary (Wankel) Engine:

    1. 295cc maximum displacement. Minimum weight will be determined by the formula (105lbs + 1lb per cc). Note that 295cc engine would weight 400lbs.

    2. The exhaust system of all rotary powered karts must be completely wrapped with heat insulating tape (other suitable heat shields that shield the entire pipe and muffler, if installed, may be submitted for approval).

  1. Forced Induction/Nitrous Oxide:

    1. If a kart is equipped with some type of a forced induction system or a nitrous oxide system, add 15lbs for each cylinder that is served by the system.
  1. Mixed Engine Type in Multiple Engine Situations:

    1. The minimum weight for the engines, with the higher weight, of the largest of the two engines will be imposed.
  1. Fuel:

        1. There are no fuel restrictions. No illegal substance or substances may be used as fuel or a fuel additive.










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