Lanse, depending on the application of that carb, some of them used the plug, and some of them used the adjustable needle. The threads on the plug, and the threads on the adjustable needle are exactly the same.
If your carb has the adjustable needle, there is a reason. The main fuel metering jet down inside that hole is larger than required, but by using the adjustment, you can fine tune the fuel flow to the exact needs of the engine, which will result in optimum efficiency.
I have a spare Zenith carb that I could rebuild, but I'm not sure if mine is compatible with your application. Does your carb have any numbers on it? What are those numbers?
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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