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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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