Electric choke 18mm Carburetor most commonly used for (and not limited to) 50cc GY6 style engines. Also used for some 2-stroke 49cc, 4-stroke 49cc, 50cc, 70cc and 90cc scooters (direct replacement carburetor for the 49cc/50cc Benelli scooters for example) and smaller 4-stroke automatic ATVs and go karts / buggies.
Manifold Inner Diameter: 18.29mm
Manifold Outer Diameter: 28mm
Breather Inner Diameter: 34.8mm
Breather Outer Diameter: 39.6mm