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Purdy Swoft · 07-02-2014, 10:50 AM

All true but..The air adjust screw only effects operation when the Zenith carburetor is runing on the idle circuit. Turning the screw clockwise as in closing richens the mix. As Duffy1 says a vacume leak would cause this condition. If its running lean, closing the air adjust screw would richen and try to compensate for the lean condition.

07-02-2014, 10:50 AM	#4
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Whatsup with carb setting? All true but..The air adjust screw only effects operation when the Zenith carburetor is runing on the idle circuit. Turning the screw clockwise as in closing richens the mix. As Duffy1 says a vacume leak would cause this condition. If its running lean, closing the air adjust screw would richen and try to compensate for the lean condition.