plugs for a 1990 60 mariner

[cougar1985]

1990 mariner 60 hp triple,can you use regular plugs in it insted of those junk surface gap plugs??if so does anybody know which ones? thanks in advance

 

[wbblc87]

Re: plugs for a 1990 60 mariner

1990 mariner 60 hp triple,can you use regular plugs in it insted of those junk surface gap plugs??if so does anybody know which ones? thanks in advance

What seems to be your problem with surface gap plugs? Most of the time when I hear this comment there is something else wrong with the engine. Mercury has used surface gap plugs for an extremely long time and I see very few true spark plug failures.

 

[cougar1985]

Re: plugs for a 1990 60 mariner

lower plug keeps fouling and dying. if i remember correctly adjusting the lower carb takes care of the bottom and middle cly. i dont want to go too far lean. maybe a hotter plug on the lower cylinder may do the trick?

 

[phatmanmike]

Re: plugs for a 1990 60 mariner

use NGK-buwh surface gap ONLY.

motor was designed SPECIFICALLY for this plug. merc has been using these plugs for 40 years.

 

[saumon]

Re: plugs for a 1990 60 mariner

On mine (1993 60 Merc. 3 cyl ser.0D074327) some sources says BUHW surface type when others says BU8H-N-10 electrode-type. I've runned both with no visible difference.

 

[bassinbeno]

Re: plugs for a 1990 60 mariner

I have a 1997 Mercury 3 cyl. 60/40 jet. Running NGK BP8H-N 10 what is the correct gap for these plugs I would like to put a new set in and aint sure what to gap them at ???

 

[dolphinhunter]

Re: plugs for a 1990 60 mariner

.040 from what i have read. my 115 uses the same i have surface gap in them now but i'm thinking of going standard.

 

[saumon]

Re: plugs for a 1990 60 mariner

The factory service manual say that they came from the factory with surface gap type BUHW but that they can be replaced by electrode type BU8HN10, gaped to 0.040.

So both types are probably fine.