Assuming that I am correct. You need to lean the engine. This is an air bleed carb and the idle mix screw works opposite to most "standard" carbs. There is a small hole in the front of the carb that lets in air to mix with the idle fuel. There is also a screw that comes in from the side that PARTIALLY blocks this hole and regulates this air flow and thus the MIX. Turning the screw CW closes the hole makes the mixture more rich. Conversely turning the screw CCW opens the hole and leans the mixture.


ONLY MAKE SMALL (1/8 TURN) ADJUSTMENTS OF THIS AT A TIME. THIS IS VERY SENSITIVE.