This 30mm / 44mm electric choke carburetor is most commonly used for (and not limited to) GY6 and CF format engines, primarily 250cc ATVs, scooters / mopeds and to a lesser degree automatic go karts / buggies and automatic 2-wheelers, 4-wheelers etc. Also a direct replacement for some variations of Odes/Kandi (Kangdi) 400cc ATVs.