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I was thinking it might be unusual electrodes were wearing on one side only and the slight glazing gave me concern engine might be running hot/lean.


The way the plug sits in the head of the 22r causes the exhaust valve to be on one side and the intake valve on the other. Combine this with a peanut shaped combustion chamber and you will get hot spots. Basically unless you are placing the plug in the center of a perfectly round combustion chamber you will always see a little bit of uneven wear. perfectly normal...all is kosher.