Burnt ceramic on spark plugs

Burnt ceramic on spark plugs

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ホンダ NSX NA1 メンテナンス中！, ホンダ NSX その他パーツ

Burnt Spark Plugs! Why?

After changed spark plugs, I am getting 29MPG. Oil builtup found on 2 old plugs

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ILzfr5e NGK Iridium Spark Plug