Seriously it sounds like you didnt install the bowl gasket correctly or the carb is going into a flood stage. The brass screw you speak of should be for the fuel/air mix and one possiblt for the idle. I have never seen a screw to control fuel flow on those type carbs. If the needle or seat is bad it will flood or if you for got the float pin it will.Also make sure the float is in the rite side up . Its hard to correctly give the fix without seeing what is happening .
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