Patent ID: 7156073

Claim:
An idle speed control apparatus in a throttle body for a single cylinder, comprising: a throttle body ( 1 ) in which a suction air passage ( 2 ) is provided through in an inner portion and said suction air passage is opened and closed by a throttle valve ( 4 ) attached to a throttle valve shaft ( 3 ), wherein a single idle air control passage ( 5 ) is open toward a suction air passage ( 2 a ) in a downstream side from the throttle valve ( 4 ), a starter passage ( 6 ) and an air screw passage ( 7 ) directed to a suction air passage ( 2 b ) in an upstream side from the throttle valve ( 4 ) are independently branched from an upstream side passage ( 5 a ) of said idle air control passage ( 5 ), a start opening and closing valve ( 10 ) controlling an opening area of the starter passage ( 6 ) by a drive member (W) is arranged in said starter passage, and an air screw ( 11 ) controlling an opening area of the air screw passage ( 7 ) is arranged in the air screw passage ( 7 ).