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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

Wico C Magneto Points Conversion


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  #1  
Old 07-24-2018, 04:52:41 PM
Bill Manning Bill Manning is offline
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Default Wico C Magneto Points Conversion

I have a Wico C on a 1939 2 cylinder John Deere L model tractor. Normally, it will start with a quarter turn of the crank. (no electric start) It sits outside for most of the year and I seldom start it. It loses spark due to the points being oxidized. A good cleaning, and it starts fine again. My question is; can I replace the points with one of the electronic modules, such as Mega-Fire Used on small engines ? Any thoughts or experience with this is greatly appreciated.
I originally posted this to the wrong thread.
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Old 07-24-2018, 04:58:09 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Wico C Magneto Points Conversion

Not sure about the conversion but when cleaning points be sure to clean the sides of the contact as well as the face. If you leave the corrosion on the sides it will migrate right back to the face. I usually remove the points and buff all of the corrosion away, much longer life after this.
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Old 07-24-2018, 06:47:03 PM
debe debe is offline
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Default Re: Wico C Magneto Points Conversion

I have tried an Atom ignition module on a Wico type A magneto & it did not work. But it worked on a Lucas SR magneto. It may be worth a try on your magneto.
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Old 07-25-2018, 02:59:07 PM
mmcdonald mmcdonald is offline
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Default Re: Wico C Magneto Points Conversion

It may or may not work depending on the state of your mag but in my experimentation with them years ago it will definitely be a weaker spark if you get it to work.
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Old 07-26-2018, 02:28:54 AM
cobbadog cobbadog is offline
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Default Re: Wico C Magneto Points Conversion

Electronic modules work ok providing you have a higher RPM than when using points. You do need good magnets and if you have an impulse mechanism on it you might see the benefit otherwise make sure the points are closed when you shut it down.
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Old 09-17-2018, 12:57:19 PM
Dempster Dempster is offline
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Default Re: Wico C Magneto Points Conversion

I never got those to last or work right. Your problems are mostly likely bad old insulation in coil windings, bad condenser. Many new points been made wrong have to make sure the rubbing block on points isn't sticking on something or the spring bracket shorted out seen it too many times had to file or grind some off with a dremel. Slack in the bushings or worn magnet shaft lets it drag causing no or weak spark. They are old and need repairs to function right again and parts are available new.
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Old 09-17-2018, 05:08:38 PM
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John in Maryland John in Maryland is offline
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Default Re: Wico C Magneto Points Conversion

One of the problems I've found on C mags is the plate that the points & condenser attach to have spring steel contacts on the back that contact "ground" the plate to the magneto frame. Those contacts become "cruddy" and the mag doesn't work or works poorly. I rebuild a c mag I attach a ground wire from the plate to the frame bypassing the contacts.

J.I.M.
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