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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!!!