Thanks for the replies. I always close the fuel shut off valve under the tank. But it seems viton tipped needle valves start sticking closed not after much use. Ascsoon as the engine comes under load it hunts and surges and the bumper spring and idle mixture screws don't cure it. Replacing the needle valve stops the hunting and surging for awhile until the new valve starts to stick.
Would a needle for a Marvel carb fit in a Zenith's seat? A few places online sell brass needles for Marvel carbs.
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