| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an air-fuel ratio control system for an air-fuel mixture in a carburetor in which in a low-speed operation region, while stabilizing operation, the air-fuel ratio for the air-fuel mixture can be automatically controlled to be lean.SOLUTION: A secondary main air bleeding passage 40, through which air can be supplied, is connected to a main air bleeding passage 26 on downstream side of a main air jet 26a; a secondary slow air bleeding passage 41 through which air can be supplied, is connected to a slow air bleeding passage 27 on downstream side of a slow air jet 27a; and a negative pressure responsive valve 30 which opens according to the rise of a boosting negative pressure of an engine E, is connected to these secondary main air bleeding passage 40 and secondary slow air bleeding passage 41.</p> |
