Quick Fuel Black Diamond Marine Series 650 CFM 4-Barrel Carburetor # M-650Carburetor, Q Series Marine, 650 cfm, Mechanical Secondary, Electric Choke, Satin Black, Dual Inlet, Each M 650 CFM: 650 Fuel Category: Gasoline Remanufactured: No Number of Barrels: 4 Carburetor Flange: Square bore Choke: Electric Secondary Type: Mechanical Fuel Inlet: Dual Primary Jet Size: 71 Primary Power Valve (Hg): 6. 5 Hg Secondary Jet Size: 78 Primary Outer Air Bleed Sizes Included: 70 Primary Inner Air Bleed Sizes Included: 31 Secondary Outer