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Typical fixed-jet carburettor

Typical fixed-jet carburettor Choke disc; the throttle disc or butterfly is lower down. Choke linkage Throttle-stop screw restricting the travel of the lever. Throttle lever, connected to a throttle rod. Volume-control screw: this one regulates fuel flow. Fuel pipe The accelerator pump delivers a litle extra fuel for acceleration.

The jets in this type of carburettor are not adjustable, so the air-fuel mixture is adjusted by directly regulating the flow of fuel or air into them.