Keihin downdraft carburetor with mechanical choke control. The primary throttle valve is opened mechanically, the secondary throttle valve is opened by vacuum created in the primary diffuser. The vacuum controlled choke is moved by the pulldown block, opening the choke on acceleration and in a cold wide open throttle condition.
On the Keihin I carburetor, the vacuum system includes a spherical vacuum reservoir. Idle speed cut-off valve fitted on both carburetors and Keihin I carb includes main jet cut-off switch (photo).
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