Ford Model A - Zenith carburetor idle adjustments for throttle shaft and plate

Helpful tips to adjust the Zenith carburetor in your Ford Model A so that it idles better at low speed. Focus on the throttle shaft and plate adjustments.

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I would suggest assembling the throttle valve in the throttle shaft each time you want sand or file on it. It holds the valve "square" in the bore, otherwise you run the chance of it being crooked in the bore.