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  • Re: Spark Plug color on one side?

    IMO, normal... approx half the porcelain insulator will retain it's natural color. Here's what NGK Iridium plugs looked like after 18,444 miles on my bike. Note the upfacing white insulators on 2 of the plugs Original NGK Plugs @ 10,284: [
    Posted to Technical Discussion (Forum) by AlanH on 09-11-2007
    Filed under: How to, Spark Plugs, Iridium Plugs
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