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I'd always though fuel/leaning out is bad but that incorrect spark or over energetic spark was a myth when it comes to piston melting.
Re: that link... I know there's logic behind it but if the direction of the earth shield on the plug was important Shirley there'd be a more precise method of placement.
TRA
lynx
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Doesn't that usually mean a spark plug/fueling issue?
Stoopid question but have you indexed the spark plugs? http://www.enginelabs.com/news/getting-the-most-out-of-your-ignition-spark-plug-indexing-101/