J4 magneto repair shop

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John *.?-!.* cub owner
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J4 magneto repair shop

Postby John *.?-!.* cub owner » Wed Jul 12, 2017 11:22 am

I have always thought I was fairly decent on the J4 mags, but I have one that has me stumped. It starts a little hard cold, and very hard or not at all hot. I have replaced points and condenser, coil, and impulse coupling spring. I have also swapped coils and coil covers with another magneto that works good on this tractor, still have the same problem with this mag. Spark appears to be good cold, jumping 3/8 to 7/16 inch, but does weaken hot. The only thing I can think of is the magnets may be getting weak, which would be the first time I have seen that on a J4, and I have worked on several of them. I need to find a shop to check it out. There was a place called Magneeders in Carthage, MO. but that appears to be closed.
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Re: J4 magneto repair shop

Postby Don McCombs » Wed Jul 12, 2017 11:28 am

I know of one in Simpsonville, SC. :D
Wouldn't hesitate to recommend him. His name is Rick Spivey. :D
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Re: J4 magneto repair shop

Postby Barnyard » Wed Jul 12, 2017 11:31 am

Don McCombs wrote:I know of one in Simpsonville, SC. :D

And he is a great guy. I have used his services several times and have always been happy with the results.
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Re: J4 magneto repair shop

Postby staninlowerAL » Wed Jul 12, 2017 11:42 am

He rebuilt one for me at DSCF last year. Even allow me to watch and learn.

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Re: J4 magneto repair shop

Postby Mr E » Wed Jul 12, 2017 11:49 am

And did one for my H that almost stumped him. But he prevailed and figured it out.
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Re: J4 magneto repair shop

Postby Bill Hudson » Wed Jul 12, 2017 11:51 am

Rick is the magneto 'go to' guy.

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John *.?-!.* cub owner
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Re: J4 magneto repair shop

Postby John *.?-!.* cub owner » Wed Jul 12, 2017 11:56 am

I sent Rick a PM with a link to this discussion.
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Re: J4 magneto repair shop

Postby Rick Spivey » Wed Jul 12, 2017 6:22 pm

I've sent John a pm describing my proposed actions. But for everyone else, I will say I ran across one other J4 magneto that had lost its magnetism. I didn't believe that would happen at first, but then I got it in my hands and confirmed it. While many older mags have the magnet in the stationary part, the J4 has a magnetic armature, made of Al-Con (I think I got the alloy name correct). I believe It is supposed to be a "permanent" magnet, but I suspect you could damage it if you got it near other magnets or electrical fields. When removing this part, you need to take care to store it properly until re-assembly. I use a PVC holder (pipe), and store it away from other "stuff". There are a few "professional" stores out there that deal with these. I don't remember all I have encountered over the years, but there is one that comes to mind know as "Mainly Magnetos" (I may have spelled that wrong) in Maine. What I offered John was a swap for another armature (I have several cores), and either he or I can try it. Many people don't like or appreciate magnetos like I do, but I still run 3 cubs off mags. I don't have to keep up 6 volt batteries, and they start every time. To each his own, that is not a hill I wish to die on. But for all you mag lovers, help is available, and these puppies can be fixed every time. It just takes patience (or as Dad used to say, "holding your mouth right").
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Re: J4 magneto repair shop

Postby Dave F. » Thu Jul 13, 2017 12:35 am

Rick, I Like Mags. Do you know any thing about Wico X mags. Dave F.

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Re: J4 magneto repair shop

Postby Rick Spivey » Thu Jul 13, 2017 5:01 am

Dave F. wrote:Rick, I Like Mags. Do you know any thing about Wico X mags. Dave F.


Dave,

I think I opened up a Wico one time, probably just to dress the points. I don't have any experience with them, nor have I ever tried to source parts for one. As popular as the Wico mag was, I feel certain many parts are still available. I have tried to specialize in J4 and H4 mags, just to help the folks on this board. I would be glad to offer advise, but I don't think I am ready to branch out into other magnetos yet; some require specialized tools which I don't own.
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John *.?-!.* cub owner
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Re: J4 magneto repair shop

Postby John *.?-!.* cub owner » Thu Jul 13, 2017 8:05 am

I have learned there is a place in Maine called Mainly Magnetos that is a second generation shop and has good reviews.
http://www.mainelymagnetos.com/
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Re: J4 magneto repair shop

Postby Posco » Sun Jul 23, 2017 9:20 am

John *.?-!.* cub owner wrote:I have learned there is a place in Maine called Mainly Magnetos that is a second generation shop and has good reviews.
http://www.mainelymagnetos.com/


He lives about two hours from me. I took mine to him (about two years ago) to have him rebuild it thinking he would do the work and send it back to me. He did it on the spot. He put aside the work he was doing, told me to hit a restaurant down the road and come back in about two hours.

He has some rather antiquated testing equipment but it did the job and was neat to watch. He bead-blasted the exterior and sprayed it with a protective coating when he was done tinkering with whatever internal problems the mag was suffering from. Looked and acted brand new when he was done.

Would not hesitate to recommend the guy.

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Re: J4 magneto repair shop

Postby tst » Sun Jul 23, 2017 10:42 am

Marks Magneto in CT is a good shop also, they charge the magnets back up, I do not think there is any crazy tool to do this, poke around the net and I am sure some one will say how its done

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Re: J4 magneto repair shop

Postby BIGHOSS » Sun Jul 23, 2017 10:55 am

Several years ago, there was a fellow named Jones in McMinnville TN who repaired mags. He showed me his magnetization machine. He got it from a John Deere dealer that went out of business. As I recall, it was a complete mag testing station.
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