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J 4 magneto question


 
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jsfarmall
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PostPosted: Sat Feb 18, 2017 4:56 am    Post subject: J 4 magneto question Reply to specific post Reply with quote

I never fooled with a mag. A project cub I recently acquired it has a mag and no starter. So my idea is to leave it hand start with the mag and not use a battery. How do I test the magneto without it on the engine? The engine is currently in pieces on my workshop floor lol.
 
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KL in Wi
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PostPosted: Sat Feb 18, 2017 5:17 am    Post subject: Re: J 4 magneto question Reply to specific post Reply with quote

Well, you could do like I did years ago. I clamped the mag in a vice, put a spark plug wire in it and told a (friend) of mine to hold the end of the wire and put one hand on the vice. The mag only had to snap once for me to know it worked. Poor guy hasn't trusted me since.
 
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Tom Dowling
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PostPosted: Sat Feb 18, 2017 9:07 am    Post subject: Re: J 4 magneto question Reply to specific post Reply with quote

thanks for the laugh... my older brother used to test them that way on me when I was a kid.
 
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john *.?-!.* cub owner
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PostPosted: Sat Feb 18, 2017 10:59 am    Post subject: Re: J 4 magneto question Reply to specific post Reply with quote

You have learned one way to find if it hurts, but to find if it will fire a spark plug, clamp it in a vice, and connect a wire and spark plug to the coil cap.and ground the plug to the magneto body. put a ratchet and socket on the nut that holds the impulse and turn it till it trips. If you get a good hot spark you know the points, condenser, coil, and impulse are all good. Note, if it has been setting an extended period the points may need filed or replaced, and coil may also be weak. Coils are expensive.

Once you have good spark from the coil cap, connect wire back to distributor cap and use plug wires and spark plugs to see if it fires the plugs in order 1-3-4-2. There is not a spark safety gap built into the J4 or H4 mags, so it is not recommended to trip them without someplace for the spark to go.
 
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john *.?-!.* cub owner
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PostPosted: Sat Feb 18, 2017 11:00 am    Post subject: Re: J 4 magneto question Reply to specific post Reply with quote

Editing does not work, and I forgot to mention the impulse should trip 2 times per round of the impulse shaft.
 
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jsfarmall
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PostPosted: Sun Feb 19, 2017 7:54 am    Post subject: Re: J 4 magneto question Reply to specific post Reply with quote

That's hilarious! That's for sure on way to do it.
 
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