I have found that, if someone took the carburetor apart, the brass insert for the main needle, may be installed incorrectly. There is a locator pin at the bottom. The brass spool needs to be installed correctly in order to get fuel to the engine (off idle). Fixed the one I was working on, for hours, trying to figure it out.
An absolute GUESS/Sudjeswtion, perhaps one of the diaphrams has a split/crack, thus y works with choke???
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