The 4010-4020 gas tractors were hard starting and tended to foul plugs right from new. The culprit is the weak stock ignition system.
Replacing the ignition switch with it's built in ignition resistor will help a little, but even with a new switch/resistor, running voltage at the coil is only about 5 volts, so ignition spark is pathetically weak. I converted mine to an electronic ignition system years ago and find it a totally different working tractor.
Where it used to not start if it was a little damp or cold, it now will start even with wet snow or rain on the cap, plus it no longer fouls plugs.
Get a good electronic ignition system on there that eliminates the stock ignition resistor and you will have a great running tractor. Mine even runs on less fuel, as I no longer have to set the carb over rich to compensate for the weak stock ignition.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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