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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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