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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 help!


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  #1  
Old 08-21-2015, 08:44:48 PM
Matt1931 Matt1931 is offline
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Default Wico c help!

It's on a 1936 Jd br and I don't think it's hot enough. I put a screwdriver in the coil wire hole and put it about a 1/8th in away from my work bench ( that I also had my leg against.) And I turned it past impulse and bam! ⚡️Spark at screwdriver - 3 of my fingers holding the base and my leg. So do I have a small short going to the base? So I started to take it apart and impulse nut was finger tight. So I removed it and spring unwound, so now what? How many times do I wind it? Anything to look for? Spark is blue but small at plug
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Old 08-22-2015, 01:39:05 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Wico c help!

You might need a magnet recharge. As for the spring, I have no experience with it, sorry.
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Old 08-23-2015, 01:44:31 PM
mmcdonald mmcdonald is offline
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Default Re: Wico c help!

The spark generated at the coil output is trying to find it's way to ground(which in this case is the magneto housing). Evidentially the best electrical path in this scenario for that was through your body. Spring needs half a turn of pre-wind after you wind it enough to fit the drive plate. Make sure the spring ends are fit in the drive washer on shaft and in drive cup. Turn cup CCW enough so that it can be installed then 1/2 turn additional and install). If it hasn't been done recently a magnet charge as suggested would be a good idea(needs to be done when you will no longer be removing the coil as this weakens the magnet every time you have it out). Also highly possible coil or condenser is causing problems. Should jump 1/4" spark gap minimum consistently. I have had a lot of people over the years tell me mag is hot because it shocked them. You will feel a "good jolt" at far below what that mag needs to do to run the engine.
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