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Correct spark plug for Mercury 25

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  • Correct spark plug for Mercury 25

    I have a 1988 Mercury 25 2 Stroke (SN B267056) and the current spark plugs that's in it is an NGK BUHW (gapless style), but I have seen it listed online as also taking an NGK BP8H-N-10 (extended tip).I think either one will work, but I'm wondering what it came from the factory with.If it is the normal style plug, I'd also be curious as to the factory gap setting. Thanks for any advice!


  • #2
    Re: Correct spark plug for Mercury 25

    My Seloc manual shows a Champion L76V surface gap plug for that motor.

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    • #3
      Re: Correct spark plug for Mercury 25

      Thanks for looking that up JKW!Hmm... That's interesting. Some of the other posts I've read seem to lean towards NGK as the standard for Mercury. Does anyone else have any literature that suggests another type plug?Thanks again for the help!

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      • #4
        Re: Correct spark plug for Mercury 25

        Bump...

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        • #5
          Re: Correct spark plug for Mercury 25

          OK, did a little more digging and the Mercury parts site lists a handful of different plugs for my model. I refers to Service Bulletin 91-36 but doesn't say what it is.Does anyone know where or what Service Bulletin 91-36 is?Thanks!

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          • #6
            Re: Correct spark plug for Mercury 25

            ^
            I've learned from Sages, and I've learned from Fools.

            My project (with index): 1964 Jet Star: http://forums.iboats.com/forum/boat-...nabout-project

            Completed condensed version: The Permanent Vacation

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            • #7
              Re: Correct spark plug for Mercury 25

              post your e-mail and I'll send you the service bulletin.Chris...........
              The world takes on a whole new perspective when viewed from 100' below...



              1972 Bertram 'Bahia Mar' 20
              2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
              **
              Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
              **
              Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

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              • #8
                Re: Correct spark plug for Mercury 25

                Sorry about bumping this topic but it the closest to my question. I also have a 1988 25 HP Merc. Mercury Marine Canada recommended that I use a NGK BPZ8H-N-10 plug because of our water temps and the requirement for a resistor type plug, but like an idiot I forgot to ask for the gap. Anybody happen to know it?

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