The green stuff (verdigris) comes from water left in the carb. Water could be from condensation, or from ethanol in the gas. (The ethanol in regular gas and E85 will always have a bit of water, and depending on how the fuel is stored it could pick up a lot of water.)
There are a lot of things that can cause dieseling. Make sure the idle mixture screw is working (which means the idle circuit is OK). It may be that the idle stop has to be screwed way in to make up for a plugged idle circuit.
Make sure all four cylinders are hitting by pulling the plug wires one at a time. These engines run very smooth, and you can have one or even two missing cylinders and it will sound like it's running fine.
If everything seems to check out, it may have carbon deposits in the combusion chambers. I've had some success with using snake oil gas treatments that supposedly remove carbon deposits. I'm not sure if they really work or if it's in my head, though.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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