Posted by Nebraska Kirk on August 27, 2012 at 21:39:31 from (207.91.4.159):
In Reply to: E-4A Mag Question posted by F-Dean on August 27, 2012 at 19:12:27:
That is the spark safety gap, turn the screw in tight, that is all you have to do.
When the magneto is spinning and producing spark, that spark WANTS to find a ground. If it is not hooked up to spark plugs, then the high voltage spark will find the path of least resistance and could very well short out through the coil insulation if the safety gap is not there. This is not desired because when the insulation fails then the coil fails. If you take the cap off the magneto and spin it by hand you will see the spark jump from the collector ring to that pointed screw. Kind of like the pressure relief valve in a hydraulic system.
This post was edited by Nebraska Kirk at 04:20:29 08/28/12.
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