Ford 640 Running problem (We're stumped)


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Ford 640 Running problem (We're stumped)

Mike Walsh Our model 640 Ford tractor runs great when it runs. We can't seem to be able to figure this one out. It seems like it is starving for fuel. I rebuilt the carb (adjusted float, new needle valve and seat, cleaned all ports pretty throughlly), had the gas tank cleaned (boiled, and a new liner installed, checked the fuel line and tank shut off valve/ ports. After running for 300' - 500'it starts stammering (loss of power... then picks back up, and repeats with a regular rythum). Would greatly appreciate any one who could help get to the bottom of this problem!!!
paul denney I bought a 600 w loader because I wanted the loader for my ford 801. The ford 600 ran just like you describe. Problem was fouled spark plugs, I couldn't replace them often enough. With new plugs ran great for a few hours, then loss of power. I got rid of tractor.
Mat I had a simular problem with my 640. I changed the gas line to go out the front and along the side so it doesn't run down behind the exhaust manifold and has worked fine.


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