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I have a 1976 Mercury Thunderbolt 115 outboard and I would like to change the spark plugs- I have purchased new plugs NGK -BUHW and I am wondering if I just take out the old plugs and replace or do I need to worry about setting the spark arc or any other issue?
I have a 1976 mercury 115 which has carbon build up-I am planing to use seafoam with the gas mixture but wondered about spraying deep creep (sea foam) directly into the carburators and if I need to remove the faceplate -and- or filters before doing so-I am very new to boating
