This 24mm/38mm electric choke carburetor is most commonly used for (and not limited to) GY6 engines, primarily 150cc GY6 engines. Used on 150cc ATVs, scooters, mopeds and to a lesser degree automatic go karts, buggies and automatic 2-wheelers. 150cc and 125cc GY6 parts are largely identical.
 
Manifold Inner Diameter: 23.6mm
Breather Inner Diameter: 36.5mm
Breather Outer Diameter: 42.4mm