Adjusting a Weber carburettor- Throttle-stopscrew Mixture adjusting screw

On a Weber, the mixture-adjusting screw is sealed in many later types. Idling speed is adjusted by turning the throttle-stop screw.

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Adjusting a fixed-jet carburettor

A fixed-jet carburettor mixes air and fuel by means of several jets. The jets are small holes whi...