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B mag timing
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ihscout View Drop Down
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Joined: 12 Jul 2011
Location: Northern CO
Points: 147 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ihscout Quote  Post ReplyReply Direct Link To This Post Topic: B mag timing
    Posted: 03 Jan 2022 at 12:19am
I'm still having issues with timing my mag.
I've replaced the 40° impulse coupler with a 30° one and it runs much better but still not right. What would cause the rotor to be so far off the timing lug when "fire" is as pictured?
'40 AC B - My Pappy always told me "Use your head for something other than a tack hammer!" I did. It makes a great 16 pound sledge hammer.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88448 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2022 at 2:16pm
You want the MAG to line up with the TOP DEAD CENTER mark on the crank.. That is where it STARTS... Once running, the spring loaded weights fly out and rotate the internals so you will be it to fire at the FIRE mark or 30 degrees...
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88448 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2022 at 2:19pm
WIth the motor at TDC and the mag installed, you should see the rotor point to #1  ( actually you will hear the coupler "SNAP" as you rotate to TDC.. If it is off the TDC mark when you hear the SNAP, then loosen the two mounting bolts on the mag and rotate toward or away from the engine till you get it right...

Your really listening for the SNAP... and not exactly where the rotor is pointed.. It will be CLOSE, but not exact until the SNAP.
Like them all, but love the "B"s.
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Eric B View Drop Down
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Joined: 09 Feb 2012
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Points: 978 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2022 at 3:37pm
Your internal gears may be off by one tooth. As Steve is mentioning the "snap" going off... I have always found by observing the rotor at the snap, the tab of the rotor covers half of the far side of the terminal to plug wire #1. I have had some mags where the markings to match the gears at the back are extremely faint or not visible at all. The only way to find the correct gear mesh is by studying very closely when the point begin to open. I always confirm by looking at the rotor position at the snap as I described above. It has worked every time.
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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