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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
... [Read Article]
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