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Champion Spark plug id help please


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Looks to me like the threaded part of the plug (which would have had the ground-electrode attached) has been broken or cut off. Can't see well enough in your photo of the bottom side of it, but that electrode in the bottom which is surrounded by porcelain sure makes it look that way. 

 

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I tried to zoom in and lighten the bottom area of the plug, but this is about all I can do with it. I would really look closely at that slight raised ridge around the hollow area in which the porcelain insulator is enclosed, and see if it might possibly show any evidence of having been sheared or cut off. 

Spark plug weird close-up.jpg

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