Patent ID: 6871843
Filing Date: 2005-03-29
Classification: F02M,Y10S

Abstract:
1. A carburetor, comprising: a body having an air intake passage and a fuel chamber formed therein, the fuel chamber being in communication with a supply of liquid fuel; a throttle valve disposed at least in part in the air intake passage and being movable to and away from an idle position wherein the throttle valve controls at least in part the air flow through the air intake passage to support idle operation of an engine; at least one low speed fuel nozzle communicating with a supply of liquid fuel and the air intake passage upstream of the throttle valve when the throttle valve is in its idle position; and a separate idle air passage formed in the body in communication at one end with the air intake passage upstream of the throttle valve at least when the throttle valve is in its idle position, the idle air passage communicates at its other end with the air intake passage downstream of the throttle valve at least when the throttle valve is in its idle position, and the idle air passage communicates with the fuel chamber between the ends of the idle air passage so that liquid fuel from the fuel chamber will be atomized in a flow of air in the idle air passage to discharge a fuel and air mixture from the idle air passage into the air intake passage downstream of the throttle valve when in its idle position and to the engine at least during idle operation of the engine.