This electric choke carburetor is most commonly used for (and not limited to) GY6 engines, primarily 300cc GY6 engines used on 300cc ATVs, scooters / mopeds and to a lesser degree automatic go karts / buggies and automatic 2-wheelers. Manufacturer part number 2.8.01.0000 Most commonly (though not limited to) Buyang 300cc 4x4 ATV, Gio Bear 300cc, Daymak Grunt 300cc, Midwest 300cc, ZMC Titan 300cc, Chironex 300cc Bandito, Asun 300cc Bandito and may apply to other similar variations of 300cc 4x4 ATVs from companies like Linhai, Liangzi, Kangdi and many more. This machine has been produced for 8 years and applies to the 2x4, 4x4 and 4x4 IRS (Independent Rear Suspension) models. This carb has a 46mm manifold opening, 35mm breather opening