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JD 50 has weak spark on #1 side

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R D Sutphen

08-06-2002 15:38:29




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I have a JD 50 which is missing on the #1 cylinder. I changed the plug and wire, changed the points and condensor, changed the cap and rotor and nothing helped. The spark on the #2 side will jump to the end of distributor tower while the will not jump over a 1/4 inch when you pull the plug wire out of the tower. Does anyone have any suggestions? Thanks




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Clooney

08-06-2002 17:20:47




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 Re: JD 50 has weak spark on #1 side in reply to R D Sutphen, 08-06-2002 15:38:29  
R D Sutphen, make sure you have the correct rotor for your cap. Some have one contact on the rotor & the other has 2 contacts. ~Pull the cap & make sure the rotor is lining up with the correct cap contact when the points open for that cylinder [you will have to look at the cap & then see where the rotor should be at to line up with the contact] ~It's possible the spark on the low producing side is arcing to the other plug wire if the rotor is lining up close to that cap contact when the points open. Or too far from a cap contact & must jump too far to reach the cap contact.
~Check the point gap on both cam high spots [maybe one isn't opening the points enough]
~What distributor do you have? [Wico or Delco or Delco LP].
~If you have a Delco distributor with external coil, see if you have a spark from the [coil wire] that will jump a 3/8" + gap from both point openings per revolution, if so your problem is more than likely in the rotor cap area. If you still get a dis-similar spark suspect distributor cam wear or weak coil.
~You might want to pull both plugs & while hooked to the plug wires lay side by side on the block & see if they both fire at once. [if so, suspect cap/rotor problem]
~Are you sure your problem is electrical? A 1/4" spark should fire either side.

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