Reading Spark Plugs

JoeG51

Junior Member

Join Date: Feb 2017

Posts: 1
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#1

Reading Spark Plugs

10-25-2017, 04:47 PM

I was winterizing my Johnson 40 hp, and when I pulled the plugs to fog the cylinders, there was rust on the electrodes and base of plugs. The motor was last run two weeks ago and was fine. Should I be concerned of the head gasket or should I run a compression check first?
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Joe Reeves

Senior Member

Join Date: May 2016

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#2

10-25-2017, 07:41 PM

Possibly rust was caused by condensation due to the weather change depending on where you're located. However,taking a compression check and making a note of the readings and date is always a good idea.
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