Re: Gas John Deere 4020 Spark Plug Fowling

Posted by Jon H on April 19, 2005 at 10:04:54 from (69.26.16.120):

In Reply to: Re: Gas John Deere 4020 Spark Plug Fowling posted by RustyFarmall on April 19, 2005 at 06:36:34:

If yours is an early model with the ignition resistor built into the back of the ignition switch,then I would consider replacing it if it is more than 2 years old. When my 64 4020 had the stock point ignition system,I fought weak ignition,hard starting if it was damp,and plug fouling. If everything was in great condition with a near new ignition switch resistor,the ignition was weak but useable,with poor damp starting and light load plug fouling. I finally converted it to electronic ignition,fed directly from the battery,using the stock switch and wiring only to trigger a power relay that feeds direct battery voltage to the ignition system. The tractor now starts in any conditions(even in the rain),never fouls plugs and allows a much leaner carb setting for better fuel economy. I have never had anyone say anything good about the weak stock ignition system on those engines in a tractor or combine.

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