The likely hood is a manifold leak. Either at the head, at the carb, or internally between the Exhaust and intake where they touch.
While it runs, take a propane torch (with the tip taken off so only propane comes out) and with it turned on just a little, move it all around the intake system. (do this outside, and have good sparkplug wires) If there is a leak, the engine will pick up speed and run correctly! If none, (and you are sure the carb is correct!!!) then pulling the manifold to check for an internal crack is needed. Jim
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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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