B & S Flywheel Magnets

Gunnar Storsveen

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Briggs & Stratton Flywheel magnets:
Are there one or tree magnets and which POLE orientation?
See appended 2 files
 

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  • B and S_Flywheel Magnets.jpg
    B and S_Flywheel Magnets.jpg
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  • Brigs and Stratton Magneto System.pdf
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We need a picture of the flywheel for reference. There are different designs.

What engine number is the flywheel on?

If it is only for triggering the coil, I don't think pole direction is important. If it is the magnets attached to the underside inner portion of the flywheel then the poles have to alternate between N. & S. polarity.
 

Rivets

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Type this into your search engine and I’ll bet you’ll find the answer to all your questions. how do briggs ignition systems work diagram
 

Gunnar Storsveen

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Joined
Sep 18, 2025
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We need a picture of the flywheel for reference. There are different designs.

What engine number is the flywheel on?

If it is only for triggering the coil, I don't think pole direction is important. If it is the magnets attached to the underside inner portion of the flywheel then the poles have to alternate between N. & S. polarity.
I’ll find the engine number after the first weekend and may be open the engine. I am interrested in the MAGNETRON ignition system with two Darlington transistors. This ignition system made the B & S engines more reliable.
This summer I made a barn found:
42 years B & S Magnetron engine with generator: It fired after using the recoil som times.
👏👌😀
 
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