SonexBuilders.net

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I was also curious about the failure of a solid state magnetron and found this possible clue here:

Ignition Module Failure

Because the ignition module is electronic and does not utilize moving components, it is normally one of the most reliable part of the engine. When it does fail, it is usually due to heat caused from improper wiring of the ground wire to battery voltage.

http://www.briggsandstratton.com/us/en/support/faqs/ignition-system-theory-and-testing

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Mike (& others) -

On the subject of spark-plugs, resistance, etc, Mike Busch has a decent webinar on Spark Plugs here:
http://www.eaavideo.org/video.aspx?v=1826468805001

And there was a recent development with Champion spark-plugs, as Mike commented on here:
http://blog.aopa.org/opinionleaders/201 ... cceptance/

--Noel

Always use njk plugs and so far no issue.