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Grandfathers CA
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CA13414 View Drop Down
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Joined: 25 Feb 2024
Location: Nebraska
Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 2:27pm
Yes, I did replace the coil and condenser a month ago. It still misses after warming up.

Today all I did was change the points. It is clean and not grounded. Only the condenser and coil are attached to the point.

Edited by CA13414 - 19 Jul 2025 at 2:32pm
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CA13414 View Drop Down
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Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 3:37pm
I did recheck everything. Not sure why, but I simply disassembled everything then put it back together. I was able to get a shock off the coil contact which was OK but not a hard snap of a shock. Must of had a contact and grounded out the coil somehow.

However, after timing the rotor gears there was nothing to the plug wires. I took off the distributor cap and with a screwdriver touching the coil contact, there was a shock. As well there is pressure on the cap contact rod, thus, I think this is OK.

Shop is hot and I am drenched. Back inside for a bit with a cold one.

Dan

Edited by CA13414 - 19 Jul 2025 at 4:11pm
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Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 3:40pm
Earlier I watched a "youtube" rebuild and the shock they had was an arc of about 1/2". Not what I am getting.

Maybe a rebuild however, not to keen on the idea of $325.

Dan
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CA13414 View Drop Down
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Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 6:01pm
However, after reading the various threads, everyone who bought a rebuilt magneto mentioned it was a very good move.

The "youtube" on rebuilding a magneto mentioned "recharging" the magnets! Is that a thing?

Maybe that is why "my shock" is a pansy ass shock.

Dan

Edited by CA13414 - 19 Jul 2025 at 8:41pm
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steve(ill) View Drop Down
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Points: 87205 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 7:59pm
i have several B tractors all with MAGS.. I have replaced coils and condeners and points as needed over the years.. I had ONE that was REAL STUBBORN on starting after a few years.. I took apart the the IMPULSE SPRINGs were weak and not retarding the spark to TDC when you crank.. It was OK when i turned by hand.. I finally got it to work "OK"..... couple months later there was a guy on this site going out of business and was selling his REBUILT MAGS... had  3 or 4... Said complete rebuild with RECHARGED MAGNET / new coil / NIS condenser / etc. ... so i bought it... WOW... what a difference.. Engine rolls over ONCE and its running.. HOT SPARK.. FANTASTIC... Never thought i would get that much DIFFERENCE !!

Edited by steve(ill) - 19 Jul 2025 at 8:00pm
Like them all, but love the "B"s.
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Points: 1211 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 8:30pm
Originally posted by CA13414 CA13414 wrote:

...The "youtube" on rebuilding a magneto mentioned "recharging" the magnets! Is that a thing?...

Yup, it is indeed a BIG thing. All else being equal, spark energy is (somewhat) proportional to magnet strength. And magnets lose strength as they age, requiring periodic re-charging. Back 'in the day' every significant tractor dealer had a magneto re-charging machine. I wish I owned one Smile
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CA13414 View Drop Down
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Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 8:32pm
Steve, so maybe a rebuild or different mag with a "recharged mag" will help?

Interesting. That may be the issue.

Dan

Edited by CA13414 - 19 Jul 2025 at 8:43pm
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Points: 329 		Post Options Post Options   Thanks (1) Thanks(1)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 8:34pm
Originally posted by Les Kerf Les Kerf wrote:

Originally posted by CA13414 CA13414 wrote:

...The "youtube" on rebuilding a magneto mentioned "recharging" the magnets! Is that a thing?...

Yup, it is indeed a BIG thing. All else being equal, spark energy is (somewhat) proportional to magnet strength. And magnets lose strength as they age, requiring periodic re-charging. Back 'in the day' every significant tractor dealer had a magneto re-charging machine. I wish I owned one Smile


Les, thanks for the comment. All that makes since. Maybe the rebuild with a magnet "re-charge" is a good option as you and Steve mentioned.

Much appreciated to everyone!

Dan

Edited by CA13414 - 19 Jul 2025 at 8:37pm
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CA13414 View Drop Down
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Points: 329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CA13414 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2025 at 8:48pm
Thinking about this and the role of the magnet..... to induce a current. If the magnet is weak, the induced current is weak, or for me a pansy ass spark.

Who here does a great job of "re-charging" a magneto?

As noted, I did find someone on the "internet" who does this but would feel more comfortable with someone here in the group who knows a good :re-charger!!!" :')


Edited by CA13414 - 19 Jul 2025 at 8:48pm
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jvin248 View Drop Down
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Points: 444 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jvin248 Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 18 minutes ago at 8:47pm
.

Are the magnets "alnico"? Common 1950s magnet chemistry. Alnico loses strength over time. More modern use ceramic that don't lose strength.

If you buy a pair of strong rare earth magnets off temu/Amazon you can recharge the magneto magnets. Mount to a bench vice and run your magneto magnets between them.

Don't pinch your fingers.

.
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Points: 87205 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 10 hours 10 minutes ago at 7:55am
here are a few good photos... half way down the page is the "magnetizer" to recharge oil magnets... guy has a "HOME PAGE" button at the bottom..
Like them all, but love the "B"s.
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Points: 444 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jvin248 Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 30 minutes ago at 1:35pm
.

Here is recharging a guitar pickup magnets, made of alnico.

https://youtube.com/shorts/26zdiZ6xRhw

https://youtu.be/ufhUd4wkPMs

There used to be a video where strong magnets were stuck, setting correct polarity of each, to the faces of a vice to control the space to slip a magnet between and charge it up.

.


Edited by jvin248 - 4 hours 28 minutes ago at 1:37pm
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