Electric choke 18mm Carburetor commonly used for (and not limited to) 50-250cc engines. Commonly used for other smaller 4-stroke 50cc, 70cc, 90cc, 110cc and 125cc ATVs and go karts / buggies as well as a wide variety of other motorized products. This carburetor has a 18.6mm manifold opening, 33mm breather opening.