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!
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!
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!
post your e-mail and I'll send you the service bulletin.Chris...........
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2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
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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?