I'd agree with that. If it's running with it choked, even just choked a little, it's not getting enough gas in the air fuel mixture.
"enough gas" is a relative thing. Relative to the amount of air getting into the cylinders.
IF the carb really is "ok", and it only runs while choked - then it's most likely getting extra air into the mixture, thereby lowering the amount of gas to air in the fule/air ratio - and that could only be from an air leak.
.. but it REALLY sounds like blockage in the carb.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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