Simultaneously, the cam on the starter lever will open the throttle beyond the normal idle position, according to the setting of the fast-idle stop screw 4, to provide the fast-idle speed when the motor is cold. In the full rich position the largest hole will be in communication with the starter circuit and provide the richest mixture. While the choke remains in action the car may be driven away but the control knob should be released or pushed in gradually as the engine attains normal working temperature. When the motor fires the increased depression will lift the air valve 18 to weaken the initial starting mixture and prevent the engine stalling through over richness. Simultaneously, the cam on the lever 6 will open the throttle beyond the normal idle position according to the setting of the fast-idle stop screw 4 to provide the fast-idle speed when the motor is cold. In this manner the enriched mixture necessary to ensure cold starting is provided. In this manner, the correct level is automatically maintained the whole of the time the carburetter is in action. Screwing upwards weakens the mixture, downwards enriches it.As the petrol level rises the float lifts and, by means of the float arm and tag, closes the needle on its seating when the correct level has been attained. Use a coin to turn the jet-adjusting screw one-eighth of a turn at a time, waiting each time for the engine speed to settle down. Make sure that the jet remains centralised. Keep the jet central while you adjust the mixture by taking the damper rod out of the top of the carburettor and pushing a pencil or soft metal rod firmly down the hole to hold the jet in place. If the jet is central, the piston falls with a sharp click. Off the engine before adjusting the mixture, and check that the If it rises and stays fast the mixture is too rich. If the mixture is correct the engine speed should rise slightly for a moment, then return again to normal. Listen to the engine note while you do so.
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January 2023
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