Flywheel magnets recharge

[Michael]

Hello,
Who in the club can recharge a 1936 Evinrude model 4148 flywheel?
Thanks

[The Boat House]

I can recharge flywheel magnets but while this does increase
the magnetism it doesn’t benefit how one starts or runs. Most
motors from this time have never been recharged and they start
and run just fine so don’t give up on this motor because you
feel its necessary to get it going. After making a considerable
investment in a magnet charger I stopped recharging magnets
of the motors I have restored as there was no obvious benefit
from doing so. I just recently got this 1937 Johnson running
again. Although I have only been able to bench test it, it seems to
be ready to be put back in use and that is the plan this summer.
I’d be more than willing to do yours but the cost of shipping
(both ways) doesn’t justify the result IMO.

https://www.youtube.com/watch?v=S_cTrjdTmzs&t=3s

• This reply was modified 3 years, 10 months ago by The Boat House.

[Mumbles]

Michael wrote:

Hello,
Who in the club can recharge a 1936 Evinrude model 4148 flywheel?
Thanks

Do you have a local chapter near you as some members own a Stevens or similar unit needed to charge weak magnets. A strong magnetic field is necessary to generate a good spark and iron flywheel magnets in pre war motors tend to degenerate with age but not so much for post war magnets made out of ALNICO.

Since I couldn’t find a charger anywhere, I ended up making one.

[geary]

Michael,
Our Western Reserve Chapter has a gentleman ( Bill Mohat) who has a magnet re-charger. Bill will recharge your flywheel for free if you send it to him and pay for the shipping back ! You can contact Bill at ( wmohat@gmail.com ) or call him, his no. is in the directory.

Gary

[bob-d]

Tubs, the idle on your motor is amazing. So smooth. Job well done.
Spectacular restoration as usual.
Bob D

[Michael]

Rubs,
I hear you and will try to make sure everything else is good. I do have spark on plugs outside of cylinders, but not sure it is strong enough. Magnets feel kinda weak to me so hence the question. Engine in question is a 1036 Evinrude fisherman, model 4148.
Mumbles, unfortunately there is no chapter near me and I am the only member in the country – Bermuda. Nice looking charger BTW.

[The Boat House]

The little 1/2 hp. motors from the late 30’s
have the smallest flywheel and likewise
the smallest magnets of any outboard motor.
As they are pre war motors they have iron
magnets and they do loose magnesium over
time. They also have a coil that has failed
by now. In this video the motor is running
using a coil from a 1949 Mercury 10 hp.
KF-7 Super 10. That magneto has permanent
magnets that are not only larger but way
stronger than what is in the 1/2 hp. flywheel.
In spite of the fact that there is a major
reduction in magnesium there is still enough
to produce a spark so the motor will start and
run. Its a myth that these early magnetos need
to be recharged to start and run properly. The
problem with spreading this myth is convincing
people they have a problem and they are not
able to solve it when in fact that is not their
problem at all. You would be that example. The
strongest spark is produced when the polarity
from the magnets changes as it passes over the
coil. This is when the points should open. You
achieve this by setting the points at the proper gap.

https://www.youtube.com/watch?v=71W9cPMV09A

[JOHN HOLBIK]

Well said Mr Tubs.

[Mumbles]

There’s some interesting observations by club member Bill Mohat in this older thread about recharging flywheel magnets. In particular, how the sizes and composition of the magnets changed thru the years affecting their strength and their need for periodic recharging. Obviously, not all magnetos are the same so test results for one will not necessarily apply to all.

https://www.aomci.org/forums/topic/recharge-magnets-on-fly-wheel/

[The Boat House]

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