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Message: [QUOTE="jaguar, post: 1432912, member: 19340"] I'm not sure but it may be that most air cooled engines run hotter plugs than water cooled because water cooled heads shouldn't get any much hotter than 260 degrees (with a 15 lb radiator cap). An air cooled is OK with no more than 450 degrees, above which the aluminum is weakened. I think I read somewhere that the spark more readily jumps from a hot tip than from a cold one. Also, hotter is more self-cleaning. [/QUOTE]