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Gas John Deere 4020 Spark Plug Fowling
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Posted by Jerry Young on April 19, 2005 at 06:09:56 from (209.107.239.72):
I have recently completed a valve and head job for a 4020 gas tractor. The cylinder compression is respectable and similar between cyclinders. The intake manifold was replaced some time ago and is tight with no leaks. I have also changed the system to electronic ignition and alternator from generator. I have also bought a 40,000 volt 12 volt coil. My problem is spark plug fowling. Just the slightest too much fuel(as in rapid acceleration)and the plugs fowl. Another cause seems to be long periods of idle and the plugs get fuel deposits. I am using Motorcraft BTS-10 plugs and have the carb calibrated well (Zenith). The plug wires and distr. cap are new. The plugs are gapped at .060". I have tried .080" and I beleive this span is better in the first tests. Upon pulling the plug wires while the engine is idling, a spark of 3/8" or better can be drawn between plug and wire. Idling for a time of 5 minutes or longer is terrible to this tractor. The fuel used is fine for other gas burners such as JD model A and a IH 2444. The fuel is a Amoco 87 octane blend with no alcohol. Could split fire plugs, platinum plugs, increased spark gap etc. help? I have been around 4020 gas burners for over 25 years. They work but not well when compared to 706 gasser. Any ideas?
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