Diagnosing Spark Plug Color

How To Diagnose and Read the Color of Your Spark Plug

Is your spark plug black, wet, greasy or dry, dusty or covered in soot, white and crusty or speckled with crystals, I will show you how to read your spark plug and show you what is normal. Here are the top 5 color variations and what information your spark plug is telling you about what is going on in your small engine. Is it oil fouling ...

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