Sometimes on a carb new or old,debris' gets under the needle/seat from fuel line, hair etc. also check to see if the setting is close to correct as well as if the float is not damaged or has a hole in it.
The float should be level when carb is inverted,and you shouldn't need a new bowl gasket if you are careful in removal, as carb is new.
While the fellows have had good luck with off shore parts, some of the stuff I've seen were not what I'd call quality.
You do get what you paid for usually.
Luck
