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TMiller/NC 
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Joined: 11 Sep 2009
Location: Lenoir, NC
Points: 1774
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 Topic: Magneto question
Posted: 09 Nov 2010 at 5:03pm |
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Will a Fairbanks Morse FM 4B magneto work on a 39B.
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morton(pa)
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Joined: 11 Sep 2009
Location: Lancaster, PA
Points: 1234
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Posted: 09 Nov 2010 at 5:39pm |
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I believe you mean FMJ4B. Yes, they were the stock magneto that came on the B's. The FMX replaced the FMJ in the 50's. I was told that the FMX never came from the factory, but was instead a dealer shelf part swap if the FMJ went bad.
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tododell48
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Joined: 09 Nov 2010
Location: Ohio
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Posted: 09 Nov 2010 at 6:21pm |
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Yes the fmj4b will deinitely work.
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wjohn
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Joined: 19 Jan 2010
Location: KS
Points: 1986
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Posted: 09 Nov 2010 at 7:41pm |
If it is just an FM 4B and not an FMJ 4B then I'm not sure if it will work or not - they are two different models. I think I've seen the FM 4B mags on WC's before, but I don't know about B's. Hopefully someone else with more experience will chime in.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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TMiller/NC
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Posted: 09 Nov 2010 at 8:34pm |
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I've looked again fellows and there isn't any J or X just FM 4B. Tim
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GlenninPA
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Location: Ashley, PA
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Posted: 09 Nov 2010 at 8:54pm |
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Check the lag angle set on the FM 4B as opposed to the FMJ 4B. I believe, if my memory serves me right, (which it doesn't sometimes) that you need a 30 degree lag angle for the spark advance to make the 125 engine run at it's best.
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TMiller/NC
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Joined: 11 Sep 2009
Location: Lenoir, NC
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Posted: 09 Nov 2010 at 9:15pm |
The reason for all the question is........ this magneto was on the tractor when I bought it. Have not had the engine run, but the coil appears to be bad in the mag. If it isn't correct for the B engine I'll look for another rather than have this one repaired. Thanks Tim
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