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A couple side notes to the superiority of NGK plugs;
Also to NGK's credit, they're all I use on the old two-stroke racing snowmachines anymore too.. With mixed or injected oils, Champs and others foul very quickly in comparison to a set of NGK's!.
~ Pete
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I've also got the NGK's in the outboards, I think the little boat's plugs are three or four years old and it always cranks on half a pull.