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turf
no smoke when the engine is running. oil seems to be okay also. i'll check the a4 manual about adjusting the fuel/air mix.
bandit
i ran the boat all summer on these plugs. plus they were originally in the boat when i purchased it last fall. not sure how long the plugs, cap, etc. have been on. i'm assuming the plugs were the same type. the po had a set of spares onboard which were the same type.

i'll keep an eye on it next year. just wanted to make sure it didn't sound like something catastrophic.