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  1. #1
    Cadet
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    Default 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. #2
    Petty Officer 1st Class
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    Default Re: Correct spark plug for Mercury 25

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

  3. #3
    Cadet
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    Default 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!

  4. #4
    Cadet
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    Default Re: Correct spark plug for Mercury 25

    Bump...

  5. #5
    Cadet
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    Default 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!

  6. #6
    Rear Admiral lakelover's Avatar
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    Default Re: Correct spark plug for Mercury 25

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

    My project (with index): 1964 Starcraft Jet Star

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  7. #7
    Moderator achris's Avatar
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    Default 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.
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  8. #8
    Cadet
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    Default 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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