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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Wisconsin aenl with no spark


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  #1  
Old 09-05-2013, 08:06:24 PM
Bubba o Bubba o is offline
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Default Wisconsin aenl with no spark

Hi all,I'm working on a mighty mole boring machine for a friend.It has a wisconsin aenl engine on it that has no spark to the plug.I took out the points and sanded them shiny and replaced the condencer with a new one but,still no fire.The coil looks good on the outside but,i don't know the method of testing it.What else could cause it not to fire?My friend said it ran a year ago the last time he used it and it's been sitting in the garage since.He needs it for a job coming up so any help would be great.Thanks Bubba.
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Old 09-06-2013, 11:46:56 AM
Dempster Dempster is offline
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Default Re: Wisconsin aenl with no spark

Did you see if it had any fire direct off the coil using a screwdriver with cap off ? Try a new spark plug and wire. Use non resistor spark plugs Denso L14U, Autolite 3116, Champion D16 and metallic or copper core wire only with a mag. Can do continuity tests on coil with wire disconnected from points but it could still be bad if continuity is good. Make sure wires aren't pinched and insulation washers on stop terminal are good. FM J points opening = .020" FM X = .015" Wico = .015"
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Old 09-12-2013, 12:04:29 PM
Bubba o Bubba o is offline
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Default Re: Wisconsin aenl with no spark

I have no fire direct off the coil.The points are set at .015 and plug wire and plug is good.I checked the ohms from the coil wire to the tag in the center of the coil and the reading was 6.45 does this indicate a bad coil?
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Old 09-12-2013, 06:59:53 PM
Dempster Dempster is offline
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Default Re: Wisconsin aenl with no spark

The impulse is clicking ? If not parts could be worn, broke, stuck, magnetized or broke impulse spring. Turns over easy no dragging and shaft has no slack or loose bad bearings ? Worn shaft or bent or worn cam on the shaft ? Points opening & closing correctly not installed wrong or the pivot pin being slap worn out. FM J & X plastic molded coils always been finicky to test so much so that towards end FM put out a bulletin to just use your own judgement from experience or comparison tests to a new one or just replace it. That was kind of a pain when their new coils had problems too. Graham Lee coil condenser tester specs booklet gives 4200 ohms max secondary resistance & 0.6 max primary resistance for older R2477C coils and later ones 5500 max secondary & 0.8 max primary. They can still pass that and be bad with insulation breaking down inside and won't pass heat load firing test on a coil tester. FM & Wico & some other coils especially plastic molded ones can still pass all those tests and be bad that's where the comparison test comes in if you have another good known coil to compare with.
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