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Yep..forgot about plug heat ranges affecting things. I learned that with single cylinder 4 stroke go-kart racing.
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Tom,
I doubt the plug heat rating will affect the combustion temp. It will affect how long it lasts before melting or fouling. I think that changing a plug heat rating in a cylinder is just a compensation for the heat of that cylinder; not a method of changing the heat in that cylinder.
JMO
Verne
