【Specification】 Barrel Count: 4, Choke Type: Electric Choke, CFM: 650, Circuit: 2, Emission Code: 3, Primary Main Jet: 70, Primary Power Valve: 6.5, Secondary Main Jet: 74, Throttle Bore: 1-11/16". 【Sturdy Construction】4150 carburetor is designed for electric choke and dual inlet all aluminum structure, with lower working temperature, less warpage and better durability.