Question about 13 HP Electric Start GX390
The "Air Gap" is adjusted to create an electromagnetic "charge" between the magnets of the flywheel and the coil of the ignition system. Without the correct clearance it will not produce the spark necessary to fire the spark plug. When the magnets pass closely to the coil, to make it simpler, it produces this "charge" which is then amplified by the coil that can produce as much as 25-50,000 volts
I don't want to make this sound like rocket science, but the fact is if the coil touches the magnets it will wear out the coil and the magnets and not create the right spark. Too much clearance and it will not produce a spark. I first started working with small engines in the early-to-mid 60s and discovered that by taking a sheet of note-book paper and folding it into about three layers thick, placing it between the magnet and coil loosening the coil so that the magnet would pull the coil to make contact and tightening the coil in place. The clearance would then be satisfactory to make a good spark.
It would then be a simple matter to turn the flywheel to rotate the paper out from between the flywheel and coil.
Posted on Oct 19, 2013
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Posted on Jan 02, 2017
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