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Can a leaking head gasket

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Cause your plug to be dark and sooty? My jetting seemed about right, but when I tore into my head to inspect the gasket, I noticed my plug was very dark and sooty. Can it be the coolant, or more likely jetting? :cry:

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Jetting. If any coolant was leaking into the combustion chamber, it would have a scouring effect (think steam-clean) and the plug wouldn't be dark! Hope this helps :cry:

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