idle air
The zenith idle air tube can get clogged leading to a varying idle speed. A Quick clean is by inserting the tip of carb-cleaner nozzle on the small hole for the air bleed . This is on the right side of the choke flap.
JC Whitney among others carries a carb synchronizer . German make ,and excellent in use , use adapter as mentioned by Jmela.
regards
mak
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mark
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