Often, this is a symptom of the idle mixture set to rich. Would suggest readjusting the idle mixture screw AND throttle positioner screw to a leaner mixture with a greater opening of the throttle positioner screw.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
