- paul-ryan.info Slow-running jet Float needle valve Throttleclosed Emulsion tube Volume-controlscrew

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

The fixed-jet carburettor resembles the simpler variable-jet type (See How variable-jet carburet...