Abstract: A carburetor for an internal combustion engine. The carburetor has an outer body defining a first venturi and having an inlet and an outlet. There is a first inner body located in the outer body and defining a second venturi and having an inlet and an outlet. A throttle valve controls air supply to the inlets of the inner and outer bodies. Air is agitated as it flows through the bodies. An injector nozzle is positioned to feed fuel to the second venturi. A valve controls fuel supply through the injector nozzle and sensor means determines movement of the valve. An idle jet feeds fuel to the second venturi downstream of the jet nozzle.