Uploaded April 2026 | Updated September 2026, 3 weeks ago

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Spark plug reading seems to be a lost art or at the very least, extremely misunderstood. Today We'll test your ability on reading a plug, and show you three more things about spark plugs including how to use an old school reading glass, looking at viral spark plug testers and if cleaning plugs actually works.

How to Read Spark Plugs - youtu.be/Y1h45HaxOs8
Spark Plug Heat Range - youtu.be/oLnjE3fsNow

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