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The question returns: do you have a shop manual? The choke adjustment should be outlined there. Specs will say idle should be adjusted to a specific RPM. The two idle mixture screws in the base of the carburetor control the air to the idle mixture. Screwing them in will allow less air. Screwing them out will allow more air. Usual adjustment is to screw the adjustment screw in until you detect a drop in the idle speed, then turn the screw out half turn. Then do the other and go back and check the first one.
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