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[QUOTE=51 MERC-CT;1740011]Check pump stroke.
Mike has an excellent suggestion. 99% of what I have worked on were fleet vehicles. So everything was always the way it was when it left the factory so I don't think about stuff l like that. If nobody has ever touched a vehicle you know at onetime it ran fine just the way it is so something has failed. Once other people have had their hands on something you never know what they have done? They could install the accelerator pump linkage in the wrong position. They could put the wrong power valve in it. They could have changed the jets. It was a common practice to go buy a rebuilt carburetor and exchange yours. Who knows what was done to that rebuild. If someone has been there before you, whatever they touched last is a good place to start looking for the problem. If nobody has ever touched the vehicle then a part has worn-out. The problem with flatheads is somebody that didn't have a clue what they were doing has most likely messed with it sometime in its life, plus everything is also worn-out on it.