idling fuel is fed via the top drip chamber did you inspect /clean that out ?? a side chanel feeds fuel to the top half of the carb it is very important portant to have it clean and a wrong carb gasket can
fitted on the carb would block fuel flow to the top drip chamber by blocking the side channel …
picture shows an older carb but does show the upper drip chamber while you inspect the chamber confirm that the low speed orifice is not blocked or plugged from a broken needle tip
remove the LS needle and run some pressured carb cleaner front to back … it must enter the drip chamber
btw can it idle if you prime the bulb ?… probably not but test it vent open /working on the tank ?
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