Long answer made real short: Magnets on the flywheel, but before you tear
things apart. I had a similar situation just this weekend. No spark. The
problem turned out to be a stretched cable. The handle you must hold in to
keep the mower running is connected to the ignition switch with a cable.
This cable had stretched enough that with the handle held closed it still
wouldn't close the ignition switch. Made an adjustment and it works fine.
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