| 摘要 |
PROBLEM TO BE SOLVED: To provide a motorcycle capable of smoothly accelerating without delicately operating a throttle at a low speed stage. SOLUTION: A negative pressure chamber 1 and an aerator 20 communicating with the air side A by the operation of a solenoid valve 21 are installed in a variable venturi carburetor Ca, the solenoid valve 21 is connected to a control unit Cu through a control line, a gear change stage detecting means 30 detecting a gear change stage of a transmission Tm, a speed detecting means 32 detecting speed, and a throttle operation speed detecting means 34 detecting a throttle operation speed are connected to the control unit Cu through a control line, and the control unit Cu controls so that the operation of a suction piston of the carburetor Ca operated by suction pressure is made slow by opening the solenoid valve 21 when the gear change stage becomes a preset stage, the speed becomes a set value, and the operation speed of the throttle becomes a set value.
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