Patent ID: 7377496
Filing Date: 2008-05-27
Classification: F02B,F02D,F02M,Y02T,Y10S

Abstract:
1. A carburetor for a two-stroke engine having an air intake passage that accommodates a throttle valve and a choke valve and feeds an air/fuel mixture to the engine, and an air channel that accommodates an air valve and feeds scavenger air to the engine, comprising: an interlocking lever that has a first and second cam face and is rotatably mounted on a throttle valve stem and selectively restrainable from following the opening and closing action of the throttle valve; a valve-opening spring fixedly mounted on a choke valve stem to provide a valve-opening force for urging a choke valve and the choke valve lever in contact with the first cam face; a valve-closing spring fixedly mounted on an air valve stem to provide a valve-closing force for urging the air valve and an air valve lever in contact with the second cam face, and a choke valve lever is placed in the region beyond the turning of the interlocking lever in a state in which the choke valve is open, but is brought into contact with the first cam face and restrains the interlocking lever at a position in which the second cam face does not make contact with the air valve lever, and wherein the valve-closing spring brings the air valve into a closed state when the choke valve is in a closed state, and wherein the interlocking lever is configured so that when the restraint by the choke valve lever is released, the second cam face makes contact with the air valve lever at or above a certain degree of opening of the throttle valve to open the air valve, and wherein the certain degree of opening is adjustable.