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Checking spark plugs, odd colouration

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  • Checking spark plugs, odd colouration

    filedata/fetch?id=958323&d=1651430802&type=thumb filedata/fetch?id=958324&d=1651430802&type=thumb

    Getting ready for a ride tomorrow and I decided to use my new Honda plug socket wrench and check the plugs. Both side plugs show an odd colouration which I have never seen before.

    One side of the centre electrode is a chocolate colour the other is white with no burnt on deposit. I am not worried about it but wondered why this happened. All I can think is it's the 3 valve head causing an odd swirl pattern.

    Anyone know about combustion chambers most of my bikes have been 2 valve pushrod cylinder headimage widget
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