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Spark Plug

226 Views 8 Replies 5 Participants Last post by  Karadjgne
Has anyone seen this ? Went to change my spark plugs and number one had this on the spark plug. I've never seen a plug half shaded like this.


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If the cathode isn't squared to the pin, if it leans to one side or is off center enough, that'll be the side that constantly sparks, so that's where combustion will start which could cause that shading.
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