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    Spark Plugs - Can they be interchanged with another style from the same HP outboard ?

    I have a 1991 4 cyl 2 -stroke 115 HP Mercury Outboard (just recently acquired); I just bought new spark plugs from the Marina and once I pulled the old ones out they appeared to be different: Both are NGK - Quicksilver but the old ones are a gapped plug model # BP 8H N -10 while the ones the...
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