PURPOSE: To improve starting performance of an engine by properly setting the initial opening of a choke valve corresponding to an environmental temperature. ;CONSTITUTION: An initial valve opening setter 20 is connected to be associated with a choke lever 16 of a choke valve 15 in a carburetor 11 of an engine, also to connect an exhaust temperature heat sensitizing actuator 25 associated with this choke lever 16 through a transmitting equipment 19. The choke valve 15 is driven from a fully closed condition to an initial valve opening condition by the initial valve opening setter 20 and driven from the initial valve opening condition to a fully opened condition by the exhaust temperature heat sensitizing actuator 25. The initial valve opening setter 20 is formed by providing a heat sensitizing operating part 24 deformation operated by detecting an environmental temperature, to set the initial opening of the choke valve 15 to a relatively large value at an ordinary temperature and to a relatively small value at a low temperature.;COPYRIGHT: (C)1996,JPO
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