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If you haven't uncapped and removed the pilot adjust screws and cleaned that passage, your idle circuits are not truly clean.
Before any cleaning with chemicals, remove the diaphragm/slide assemblies to prevent collateral damage to the rubber diaphragms.
Next remove both pilot screws AND pilot jets, leaving them aside, using your preferred cleaner...
spray into each opening, let them sit a bit...finally using strong compressed air to blow back and forth between the 2 openings. .
Pull the emulsion tubes...then, on the lower part of the "bells" on the intake side, the 2 tiny air correction jets (1 is for the pilot circuit, 1 is for main circuits) do a spray and soak, then blow them out as well.
As an aside....."looking like new inside" (we read about so often) is not a true measure of "clean carbs". The tiny, important hidden circuits ARE NOT visible by eye and must be aggressively treated during a cleaning as if they were clogged.
Oh, the pilot screws will have a tiny spring, washer and oring....you must account for their whereabouts and replace in the exact same order. Best to renew the orings while in there. A basic starting point for the pilot screws is 2.5-3 turns from lightly seated.
Any time when servicing carbs, float bowl gaskets and pilot orings should be on hand before starting. Leaks are unacceptable.
Good luck with your efforts.
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