Until you said that you tried another carb on it, I was thinking a sinking float. Unless the rebuilt also had a bad float. Some other thoughts that come to mind are a worn out distributor shaft, a fuel pump leaking fuel into the crankcase, or is it too rich? Too lean will also make it run poorly. Things that can make it run too lean are vacuum leaks like PCV, EGR (probably does not have EGR), or a ruptured diaphragm in the vacuum advance. Intake manifold leaks are also a possibility. Try spraying carb cleaner (NOT brake cleaner) around the intake where it joins the head. Look also for unused ports that may have been blocked at one time, but the plugs fell off. That covers most of the things I would look for. As a second thought, is it possible that there is something in the fuel tank that could be partially blocking the fuel line?
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Today's Featured Article - A Collection of Farmall Stories - by Various Authors. We receive quite a few short stories from our readers, and we appreciate every one. Presented here is a collection of two Farmall tractor stories for your enjoyment. [Editor] Memories of Dad's Farmall A J.Brandt My father first started farming with a Farmall A that he purchased in 1940. It was used on a large grain farm in North Dakota where I still live close to but do not farm. There are many memories of this tractor mowing hay and cultiv
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