Posted by john4689 on February 08, 2015 at 05:43:01 from (50.32.221.200):
About eight years ago the fuel went bad ,over the winter, in my 1940 Farmall H.
I cleaned the rust out of the fuel tank and cleaned the carburetor but it has never run right since then.
I have owned the tractor for 20 years and it ran perfectly when I got it.
It runs OK at 1/2 throttle ,but misses a lot at other speeds.
I have been using it as-is for the past 8 years but I am taking it to Beiler's auction in Lancaster Pennsylvania next week and I would like to get it to run a little better.
When I adjust the needle valves on the carburetor, It makes very little difference, almost as if the carb. is still halfway clogged up.
I have had the carburetor apart 3 times, over the years (most recently yesterday) and I just can't find anything wrong with it.
I suppose it could be an ignition problem. I can't remember the last time I replaced the distributor points. I filed them yesterday and have a new set on order. The spark plugs are new and the distributor cap and spark plug wires look OK.
The original 6 volt ignition coil fell apart some years ago and I fitted an old 12 volt coil that I had laying around. I used to have an adjustable resistor in the wire feeding the coil, but now I just feed 12 volts straight into it. Is it possible that the full voltage is too much?
Another odd thing - one time I ran out of gas and put a couple of gallons of 2 cycle chainsaw fuel mix in the tractor , and it ran like a champ!
Is it possible that my old tractor just won't run on the new type gasoline ?
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