(57) In a carburetor, a housing concave portion (15) opening toward an air intake bore
(2) is formed in an end face of a piston-type throttle valve (8), a venturi block
(17) that is to be housed in the housing concave portion (15) when the throttle valve
(8) is fully closed is fixedly attached to an air intake trunk (3), and a venturi
(18) that is made continuous to an upstream side and an downstream side of the air
intake bore (2) when the throttle valve (8) is fully opened is formed in the venturi
block (17). A connection terminal (31) of an operation wire (30) capable of opening
the throttle valve (8) through a pulling operation thereof is connected to the throttle
valve (8) in a position above the housing concave portion (15), the operation wire
(30) is arranged in parallel to a central axis (Y) of the throttle valve (8) inside
the valve cylinder (4), and a return spring (28) that biases the throttle valve (8)
in a closing direction is housed inside the valve cylinder (4). Accordingly, it is
possible to satisfy a downsizing of a carburetor including a venturi block and a light
operability of a throttle valve.
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