Posted by Bob M on September 11, 2007 at 12:39:42 from (151.190.254.108):
In Reply to: Re: Autolite plugs posted by Red Dave on September 11, 2007 at 09:50:37:
Red Dave - I think you're onto something on the resistor plugs! Here's an experience I had:
A friend of mine had all sorts of running problems with her magneto-equipped, hand-start John Deere A.
After much fussing with new plugs (Autolite 386's), wires, magneto internals, etc. out of frustration I checked the resistance between each plug's terminal and center electrode. Discovered the resistance on both was close to 10K ohms.
I then checked a Champion D21 plug and found the resistance was ~0 ohms. So installed a fresh set of D21's into the A. The tractor now cranks up and runs fine.
All I can figure is the magneto has trouble generating a hot spark thru a resistor-type plug.
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Incidentally also I believe you are correct about the 3116 being a non-resistor equivalent to the 386. However I cannot recall now where I found that information.
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