John Deere had a bad habit of oversizing the new generation gas engine carbs to get that last full throttle horsepower out of them to look good in the Nebraska tests and sales literature, but it made a gas engine that only ran decent at full load and full speed. Low and mid dirvability and mixture control was awfull. I fixed my gas 4020 by substituting a little 283 CID moline (model U)carb for the original JD carb. It starts and runs so much better at idle to 80% load . If it lost any top end power, it would take a dyno to tell it, as I cant feel any less power by the seat of my pants . sure makes a much nicer working tractor out of it.
Two other problems those gas tractors had since new was the pathetically weak ignition system and starter. I built a Delco MT25 starter to replace the wimpy stock 10MT starter and replaced the weak ignition resistor and point distributor with a powerfull solid state ignition system.
I now have a tractor with enough starter that it actually cranks so fast that it has to slow down to idle, it does not spit or smoke and it starts and runs in any sort of damp / wet weather. Also due to the stronger ignition system, it has not fouled a plug or needed any plugs replaced in over 10 years.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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