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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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