• 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.

  • As I said clutching at straws.

    The issue is that the threads on spark plugs and heads aren't equal. Different engines different locations.

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