Roger you are not using your tractor very much. Your 27 years of ownership and just at 5000 hours is only 200 hours a year. Mine would see that in a litte over a month. It had over 10,000 hours on it before I started to have troubles with it running.
I know how to make a gas engine run. I could not afford to run HIGH test gas in the fuel hog. Was using two tanks a week as it was. It would run better on the Premium gas. I bought 500 gallon and ran it. The trouble was the darn fuel. The economics just did not justify the higher fuel cost per gallon per hour of usage.
I had the Zenith carb. I switched it over to electronic ignition. I tried just about every spark plug that would fit the head. If you ran it a week on a set of plugs you would be lucky. IF you leaned it down to where it would not foul plugs it would die half the time when the governor kicked in.
I bought this tractor in the late 1980s with around 2000 original hours on it. I used it everyday to feed cattle and hogs. In about 2000 I started to have issues with it running. It now had over 12,000 hours on it. So I figured it just was worn out. I tore it completely down. Replaced the valves, guides, ground the seats, new sleaves/pistons, ground the crank, all new bearings, replaced the carburetor and a new distributer. It did use less oil but would still foul the plugs unless you ran high test gas in it. Even then it was not a great running tractor.
The issue is in the combustion chamber design. I have some friends that made a JD 4020 gas pulling tractor. They made a ported, cross flow, higher compression head for it. It runs like a sewing machine. Just too bad it needs Racing fuel to do it. LOL.
I am glad some of your guys get along with a GAS 20 series JD. I will never own a another one I have to keep and use daily. I will buy an sell one but not keep it to use.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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