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Briggs and Stratton ZZ Weak Magnets


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  #1  
Old 06-20-2019, 04:34:21 PM
pigpen60 pigpen60 is offline
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Default Briggs and Stratton ZZ Weak Magnets

I have a Briggs ZZ engine on a GI generator and I was told by the fella that gave it to me it needed a new capacitor. I replaced the capacitor and cleaned the points and while I was in there I noticed the magnets on the flywheel are very weak. After reassembly I grabbed the plug wire and spun the wheel and I could just feel a tick instead of a normal jolt. So after all this am I going to have to find a new flywheel? TIA
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Old 06-21-2019, 11:10:51 AM
pigpen60 pigpen60 is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

Could a moderator please move this to the small air cooled gas engine area?
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Old 06-21-2019, 12:41:35 PM
Vanman Vanman is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

I would imagine that the magnets could be remagnetized if need be, as with other magnetos.
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Old 06-21-2019, 03:45:57 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

A good magneto shop should be able to re-charge your flywheel. Be sure to send it with a keeper (piece of steel) across the magnets, to keep the magnets up
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Old 06-21-2019, 10:12:27 PM
K-Tron K-Tron is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

You might need a lot more than just a magnet charge. The coils in those engines often go bad at there age, and finding one in NOS condition is a crapshoot. There are a couple of guys who re-wind new coils for your particular engine, but they are not cheap. If your coil is bad, you are looking at $150 for a replacement coil.

Chris
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Old 06-23-2019, 06:05:48 PM
pigpen60 pigpen60 is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

Pulled a flywheel off another genny I have and the magnets where/are a little stronger. Installed on the genny I'm working on and I got a better jolt but not what I'm used to on a running engine. So let me understand this, if I pull a flywheel off I need to put a piece of steel on the magnets to prevent them losing their pull?
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Old 06-23-2019, 07:18:35 PM
K-Tron K-Tron is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

I am not sure where Andrew gathered that piece of information about the flywheel magnets. Briggs & Stratton, Tecumseh, Lauson, Clinton, Power Products, etc, etc did not ship brand new flywheels with any form of steel covering the magnets. As long as you do not put your flywheel next to an electromagnet you will be okay. I have picked up some ZZ's that were in pieces for decades, and neither need a magnet charge.

Chris
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Old 06-23-2019, 08:52:10 PM
gdstew gdstew is offline
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Default Re: Briggs and Stratton ZZ Weak Magnets

The NOS Eiseman and Bendix magnetic rotors I have came with a piece of steel around them. That's the way they were in the day. Never saw a flywheel with one and I had a bunch of NOS flywheels just as old.
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