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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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