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Allis B no spark

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cjallis View Drop Down
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Joined: 13 Jun 2013
Location: Sheboygan
Points: 90
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    Posted: 08 Aug 2025 at 7:45pm
Got an issue with spark. Tractor has been sitting inside for 10 years. Rebuilt head, lots of new parts. Magneto did throw spark last time I ran it several years ago. I did clean the points. They were dirty. Any help to troubleshoot the issue would be great.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2025 at 7:52pm
there may be a corrosion on the point that dont WIPE OFF.... you might want to use a very fine sand paper or point file to get more AGRESSIVE....

Once you guarantee the point is OK... the condenser next to it is suspect, then the COIL.
Like them all, but love the "B"s.
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WF owner View Drop Down
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Joined: 12 May 2013
Location: Bombay NY
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WF owner Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2025 at 7:54am
You said that you cleaned the points. Are you sure you got the gears timed correctly when you reassembled it? 

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cjallis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cjallis Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2025 at 6:12pm
It actually wasn't timed correctly but now it is. Points I cleaned with a brush.still nothing. Is there anyway to test with a meter at the coil?
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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2025 at 6:34pm
coils for mags are hard to test.. If it is the old BLACK TAR COIL, it might be suspect...If the coil is plastic coated and red or similar, i would clean the point more agressive ( i dont know how a brush could do it... i would use sand paper or a file) .... and change the condenser.... and make sure the point is not grounded, condenser not grounded, ground strap on the outside of mag insulated.

you can clamp the mag in a bench vise and put a couple wires and spark plugs on and ground them together... turn the mag IMPULSE with a pair of pliers and look for the spark... you can feel the spring WIND UP, then SNAP.. ??


Edited by steve(ill) - 09 Aug 2025 at 6:37pm
Like them all, but love the "B"s.
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Les Kerf View Drop Down
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Joined: 08 May 2020
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2025 at 7:25pm
Originally posted by cjallis cjallis wrote:

... Is there anyway to test with a meter at the coil?

The secondary windings (high-tension side) of the coil will read somewhere between 5,000-10,000 ohms; if they read open (infinity) the coil is bad.

The primary side is more difficult, it will be about 0.5 ohms (that's 1/2 of an ohm). This requires a pretty good ohmmeter, and is not definitive even if it looks good.
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nella(Pa) View Drop Down
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Joined: 11 Sep 2009
Location: Allentown, Pa.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nella(Pa) Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 7:47am
I had a problem with my B mag and sent it to Steve @B&B custom circuits  937632559six. It work well after he fixed it.
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ac fleet View Drop Down
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Joined: 12 Jan 2014
Location: Arrowsmith, ILL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 8:12am
had to put a battery dist on my B --- problem solved!! Mags are junk from the word go!!
http://machinebuildersnetwork.com/
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