Everything you wanted to know about spark plugs plus more, except if there is something you wanted to know that isn't in here, in that case it is almost everything you wanted to know about spark plugs.
MarineEngine.com NGK listing: http://www.marineengine.com/parts/ngk/
Reading a plug: https://www.ngksparkplugs.com/about-ngk/faqs/spark-plug-faqs/how-do-i-read-a-spark-plug
Spark plug cross reference site: http://www.sparkplug-crossreference.com/
For outboard repair information, checkout my website: https://outboard.dangarmarine.com/guide
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