| 摘要 |
PURPOSE:To increase the intake negative pressure at nozzle under idling and transient operation while to improve the stability by arranging a reverse F-type throttle valve while combining with C-type air valve in the air intake path penetrating through the carburetor body. CONSTITUTION:Throttle valve guide tube 13 is arranged continuously over the intermediate section of intake path 12 penetrating through the carburetor body 11. Reverse F-type throttle valve 14 is arranged movably at the engine side of guide tube 13 to stop the operating wire 14. While C-type air valve 16 is arranged at the air-cleaner side of guide tube 13 where said valves 14, 16 are arranged while facing second flange sections 14A, 16A of respective valve 14, 16 each other. Under idling, the throttle valve 14 is set to such opening as determined by a regulating chip 18 to compress the spring 19 through the throttle valve 14 under full-open state while to stop upon alignment of the throttle valve 14 and the intake path 12 resulting in smooth air flow through the intake path 12.
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