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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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