| 摘要 |
PROBLEM TO BE SOLVED: To improve riding feeling by stabilizing engine performance at the time of at least low rotation or/and a low load and to increase engine output by supercharging of air-fuel mixture. SOLUTION: This device is constituted to supply air-fuel mixture to an engine by passing it through a carbureter after passing it through an air cleaner box opening toward the front of a car body. In this case, a flap 16 installed on the air cleaner box 5 free to open and close, a servo motor (actuator) 20 to drive the flap 16 to open and close and a controller (control means) to control the servo motor 20 are provided, and the flap 16 is devised to open in the case when engine rotating speed and/or throttle opening is lower than a set value. |
