The drain plug has nothing to do with the mixture or the performance. It is strictly for draining the bowl, or test purposes.
Are you possibly talking about the main jet adjustment screw? If so, revisit the main jet. Be sure it is clean and open to it's full drilled size.
Look further up inside the bore where the main jet lives, be sure nothing is clogged. Is the venturi tube in place? Not clogged or broken off? Is the venturi in place? Did it pass the bowl drain test?
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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