?? This is a brand new replacement Carburetor Part No: 16100-KAT-913-1 150cc complete carburetor, Includes Electric Choke Inner Diameter (intake side): 24mm, Outer Diameter (intake side): 32mm, Inner Diameter (air filter side): 38mm, Outer Diameter (air filter side): 42mm?? Fit Models: QUANTUM 150 150CC GO KART, CARBIDE 150 150CC GO KART, ZIRCON 150 150CC GO KART , HELIX 150 150CC GO KART?? This Carburetor fits most makes and models of Scooters and Mopeds with 125cc – 150cc 4-stroke GY6 QMJ/QMI157, QMJ/QMI152 engine. (This is the most popular engine used in scooters.) Fits many models and makes of Scooters, ATVs, Mopeds and Go Karts. Roketa, Sunl, Baja, Kazuma, Carroll Stream Eagle, Panterra, Kymco, Redcat Tank Giovanni Aimex Jackel Wildfire Xtreme Seaseng Qlink Yiben Jonway Jmstar, Vento, Tng. and Various unlisted makes/models. QMB139 50cc/4?? Features: 1)Good at mixing fuel and air; 2) Keep engine running smoothly; 3)Prevent engine from lack of oil or oil spilling when working; 4) Avoid