Thread: spark plugs
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Old 06-26-2003, 10:39 AM
sbourg sbourg is offline
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Join Date: Jul 2001
Location: SoCal
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You should never use a metal wire brush near the center electrode insulator. If its surface is not perfectly smooth, it will abrade the metal bristles, leaving a conductive track on the insulator. Many surfaces and all ceramics are harder than common metals, and will present this problem, particularly if they are supposed to be an insulator.

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