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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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