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I thought I knew about plugs until I found this. Mine were always a nice tan colour and Id pull no.4 every now and again to watch for overheating or oil burning (mostly oil burning)

Now Ive the bigger tb on its a clean white plug though the base ring is black. I cant see the other marks yet though

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  • 4 weeks later...

Half the vid is incorrect, for example ground strap does not indicate heat range but spark lead. Anyway inspecting a spark plug is the most accurate way of telling how good a tune is and this is not jus' WOT tune, but all engine conditions. More accurate then a afr, lead or egt feedback in my opinion.


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