To easily realize a structure capable of securely setting a choke valve in a full closing state at low-temperature start.
A choke lever 5 is fixed to a valve shaft 3a of the chock valve 3, and a first idle lever 6 is rotatably provided. A throttle lever 7 is fixed to a valve shaft 4a of a throttle valve 4. First and second cam faces 11a, 11c are provided in the first idle lever 6, and an engagement piece 7a as a cam sliding part is provided in the throttle lever 7. At the time of first idle operation, the throttle valve 4 is opened by the first cam face 11a. On the second cam face 11c, the throttle lever 7 is rotated in the closing side of the throttle valve 4, and a cam driven part of the throttle lever 7 abuts on the second cam face 11c with the choke valve 3 in the full closing state. The abutting position of the cam face to the cam driven part becomes stepless, and even if the abutting position is deviated, the full closing state of the choke valve 3 is not changed. As a result, the closing state of the choke valve 3 at the time of first idle operation is secured by the simple structure, and the structure of a carburetor can be realized at low cost.
TEZUKA KEITA
ENDO MASATOSHI
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