Your pulling over to the needle jacking the slide up with the idle screw. Maybe try a #7 slide. This new carb seems like a PIA, even on a 250, which have been traditionally easy to jet. Guess I'll find out for myself.
BTW you don't need the plastic "T"s on the vent hoses. They are "T"ed inside the carb body casting, run the horizontal lines down, vertical lines up.
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