- paul-ryan.info Slow-running jet Float needle valve Throttleclosed Emulsion tube Volume-controlscrew
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The engine idling with the throttle closed. A small amount of mixture passes through the caps on each side of the throttle flap, or butterfly.

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How the fuel system works - fixed-jet carburettors

Fixed jet carburettor - Solex type A typical fixed-jet carburettor. This is a Solex, and air flo...