Carburetor fuel-adjusting device

Abstract

A device in which a needle-shaped valve element of a control valve is inserted into the throttle hole of a fuel channel to adjust the fuel flow rate. Accurate adjustments can be made with a small number of rotations of the control valve. A compensation channel 16 having a metering jet 17 for establishing the minimum required engine flow rate is provided to a valve element 13 of a manual control valve 12 that is inserted in a throttle hole 18 of a primary fuel channel 7. The flow rate is adjusted between the maximum required engine flow rate and the flow rate established by the compensation channel 16 in the gap between the external peripheral surface 13a of the valve element 13 and the entrance edge 18a of the throttle valve 18. Fuel can thereby be adjusted with a small number of rotations of the control valve 12. Accurate fine adjustment can be made with a small number of rotations even when the fine adjustment is achieved by reducing the taper angle of the conical portion 13A.

Dependencies are inferred from the claim text.