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 - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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