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Discussion Forum

Re: Magneto ??? FMJ vs. FMX on a B

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10-09-2002 18:44:30

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Uh oh, tonight I was taking apart the FMJ because that business of the 1 swing out arm under the impulse spring didn't seem right to me. I believe there should be 2 of the swing out arms (am I right here ?). It looks like I figured out the reason for the busted case (it was epoxied back together long before I bought it and that was almost 30 years ago). It appears that the cast cover which houses the impulse spring broke off one of it's 2 ears and let the swing out arm fly out at the wrong time and in turn sheared it's pin. Now I can see where the whole shebang flew out the side of the case (there was an epoxy patch covering a large jagged hole) and also cracked the bottom mounting lug.
Sooooo .......... all these years I'd been starting the "B" with parts missing from inside the magneto. Amazing it started as well as it did. Seems that I was only getting half the bang for the buck, right ?
Anyway, I can't use the FMX I mentioned in the previous post because it had a different coupler on it (the FMX has thinner/shorter lugs) and I had planned to swap the FMJ coupler. Of course this won't work because one of the lugs on the skirt is missing.
Hmmmmmmmm, guess I'm in the market for a good FMJ. Anybody know of one for sale ?

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10-09-2002 20:01:39

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 Re: Re: Magneto ??? FMJ vs. FMX on a B in reply to Ron, 10-09-2002 18:44:30  
E-mail me Do you want new or used parts????Rebuilt mag?? Impulse coupler???

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10-10-2002 05:37:29

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 Re: Re: Re: Magneto ??? FMJ vs. FMX on a B in reply to SEAMO, 10-09-2002 20:01:39  
Thanks SEAMO, I may need some parts. First, I've got to locate a proper tool to pull the "swing out arm" assembly off the shaft.

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steve corum

10-10-2002 03:50:55

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 Re: Re: Re: Magneto ??? FMJ vs. FMX on a B in reply to SEAMO, 10-09-2002 20:01:39  
hey ron, I have a fmj mag off a 1947 allis c. I replaced it with the fmx, they are a lot hotter mag more dependable. Everthing is there but the impulse spring, it worked but was hard starting. it would make you a good parts mag. 25.00 plus shipping. Iam not a parts supplier just old allis colector. hey you can retime your magwith the timing gears inside the mag itself. I have seen the fmx mag on farmall allis case. they are universal. good luck steve corum

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10-10-2002 06:09:21

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 Re: Re: Re: Re: Magneto ??? FMJ vs. FMX on a B in reply to steve corum, 10-10-2002 03:50:55  
Hi Steve....... Do you mean the FMJ was causing a hard start condition because the impulse spring was missing ?(I do have a good impulse spring and could use it to fix up your mag.) Or, do you mean the FMJ just doesn't perform as well as an FMX ?
Also, my FMX was to be used as a replacement mag on a Kohler stationary power unit. The coupler drive had a toothed gear (with slots) bolted to the double-lugged impulse spring cover. The toothed gear meshed to a gear on the Kohler unit and drove the mag. When I removed the toothed gear, I found the double lugs (on the impulse spring cover) to be narrower and slightly shorter than the originals on the FMJ (also, I would have to deal with a longer shaft that was required to mount the toothed gear). I'd love to use the FMX (cannabalize the 2 mags ?), but I'd hate to mess up a good mag if I can't properly disassemble them.

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steve c

10-11-2002 04:02:35

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 Re: Re: Re: Re: Re: Magneto ??? FMJ vs. FMX on a B in reply to Ron, 10-10-2002 06:09:21  
ron, What you can do is take the drive lug off the fmj and put it on the fmx. the fmx is a upgrade mag of the fmj. the fmx mag i had was o. k. but the impulse spring was broke so I took it out of the fmj.The fmj was a pain to fiddle with. it would run good and then the next time it wouldn`t let the tractor idle.found the fmx at the salvage yard. your fmx is a better mag. steve

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