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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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Lawnmower Flywheel Magnets
Anyone repaired, replaced, or remagnetized flywheel magnets?
My Lawnboy flywheel can't create a spark, the magnets are too weak. Looking for a fix.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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05-28-2017, 02:39 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,427
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Find a generator/starter repair shop that has a growler. They're used to recharge magneto magnets so should work on the mower too
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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05-28-2017, 03:06 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,427
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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05-28-2017, 03:10 PM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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Thanks.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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05-29-2017, 04:09 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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I could be wrong, but I'm pretty certain the Growler induces magnetic field - then you test for open / shorts in the armature through the commutator bars as is shown above. I used these as a kid working in a International Tractor dealer to test / repair starters and generators.
I do not know what the life expectancy of magnets in lawn mower flywheels - but its usually the air gap between the coil pickup / magnet that makes it go or no. Make sure each surface has no rust, set the gap as close as possible without touching; ignoring what the manufacturer or your buddy says. If you follow this, certain the points/ condenser are fresh and set correctly ( obvious) if there is not a strong spark- the likely scenario is the coil assy has failed. Most coils are still available via interwebs. BTW - a little trick to enhance power / torque is to slot the mounting holes slightly so you can move the coil assy sideways @.015 against the rotation of the flywheel. This advances timing and is really worth the effort. PM me if you have any questions
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05-29-2017, 08:13 AM
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Registered
Join Date: May 2002
Location: St Louis
Posts: 4,211
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Is this a vintage Lawn Boy and does the module look like this?
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Rick 88 Cab |
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05-29-2017, 08:26 AM
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