Why are the spark plugs black?

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sparkplugs - Black Spark Plugs that Clean Themselves - Motor Vehicle

Black spark plugs = too rich?

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Autolite® - Double Platinum Spark Plug
Autolite® - Double Platinum Spark Plug

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What Does Black Spark Plugs Mean - Homemade Movie Porn
What Does Black Spark Plugs Mean - Homemade Movie Porn

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Black Spark Plugs that Clean Themselves ~ Motor Vehicle Maintenance
Black Spark Plugs that Clean Themselves ~ Motor Vehicle Maintenance

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Carbon Fouled Spark Plug – Find Causes & Solutions
Carbon Fouled Spark Plug – Find Causes & Solutions

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Spark plug on black stock photo. Image of spark, background - 24884972
Spark plug on black stock photo. Image of spark, background - 24884972

Why are the spark plugs black?
Why are the spark plugs black?

Black Spark Plug Wire at best price in New Delhi by S.S. Engineering
Black Spark Plug Wire at best price in New Delhi by S.S. Engineering

Common spark plug problems - i-sparkplug.com
Common spark plug problems - i-sparkplug.com

Spark plugs are black again - General Automotive Discussion - SAU Community
Spark plugs are black again - General Automotive Discussion - SAU Community

Black Soot On Spark Plugs (Why Do Spark Plugs Turn Black?)
Black Soot On Spark Plugs (Why Do Spark Plugs Turn Black?)

black spark plugs = too rich?
black spark plugs = too rich?