SPARK PLUGS AND GAP FOR 1986 MERC 90HP. [Archive]

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wickedrister

10-05-2003, 02:33 AM

AT THIS TIME I DO NOT HAVE A SERVIC MANUAL FOR MY 1986 90HP MERC IN LINE 6.I DO HAVE ONE ON THE WAY.CAN YOU TELL ME THE BEST BRAND OF SPARK PLUG TO RUN AND THE RECOMMENDED GAP.
(THANK YOU)

wickedrister

10-05-2003, 02:33 AM

AT THIS TIME I DO NOT HAVE A SERVIC MANUAL FOR MY 1986 90HP MERC IN LINE 6.I DO HAVE ONE ON THE WAY.CAN YOU TELL ME THE BEST BRAND OF SPARK PLUG TO RUN AND THE RECOMMENDED GAP.
(THANK YOU)

10-05-2003, 09:45 AM

Try the BU8H plugs by NGK. They are gapless, so all you have to do is change plugs and run 'em! Make sure you look at the plugs to make sure you're not running too rich or lean (or hot/cold). Your local Mercury dealer will have a book that tells you what plugs to run.

Checkmates owned: 1995 Pulsare 2100BR/1995 Mercury Promax 225 2.5 EFI. 1995 Persuader 183/4.3 LX V6. 1992 Pulse 171/1992 Mercury XR6 150 hp 2.5 liter.

175checkmate

10-05-2003, 11:27 AM

Rich, the plugs will be black.
Lean, the plugs will be white
Just right, plugs will be a tan/brown

http://www.checkmate-boats.com/images/avatars/GusAvatar2.jpg

1975 Checkmate Tri-mate 2, 2.4 200+ / Sky jacker 6" plate / 25p Laser 2 prop

wickedrister

10-05-2003, 07:17 PM

http://www.checkmate-boats.com/6/ws/,s,8626072361/Graemlins/jpshakehead.gifOK NEVER MIND THE PLUG GAP.http://www.checkmate-boats.com/6/ws/,s,8626072361/Graemlins/jpshakehead.gif I PULLED THEM TODAY TO CLEANED THEM.MY BAD!

10-05-2003, 07:34 PM

No problem Wicked! You never know what's in a motor. Many of the new motors coming off the line have gaps. What model plug did your motor have in it? Did I guess right?

Checkmates owned: 1995 Pulsare 2100BR/1995 Mercury Promax 225 2.5 EFI. 1995 Persuader 183/4.3 LX V6. 1992 Pulse 171/1992 Mercury XR6 150 hp 2.5 liter.

wickedrister

10-06-2003, 09:15 PM

http://www.checkmate-boats.com/6/ws/,s,8626072361/Graemlins/zx11pissed.gifJW I WAS IN SUCH A RUSH TO TAKE THE BOAT OUT FOR MY 3rd TEST RUN I DIDN'T EVEN LOOK AT THE PLUG SPECS.LAST TIME OUT IT LOADED UP AND RAN WAY BAD SO I PULLED AND CLEANED THE PLUGS.SHOT SEA-FOAM IN THE CYLINDERS AND IN THE CARBS.TREATED MY 16 GAL TANK OF(REGULAR GAS) http://www.checkmate-boats.com/infopop/emoticons/icon_mad.gif WITH SEA-FOAM AND 104 OCTANE BOOSTER.I RAN WAY DOWN YHE LAKE AND BACK.USED OVER 3/4 TANK OF GAS.THIS TIME IT RAN FINE.MY 17 YEAR OLD RIG JUST NEEDED THE COBWEBS CLEANED OUT OF IT !

F150GT

10-06-2003, 09:54 PM

GOOD FRESH 92 - 93 OCTANE GAS CAN MAKE ALL THE DIFFRENCE. A COUPLE MILES AN HOUR OVER STALL GASS.

10-06-2003, 10:05 PM

That's why I've always loved Mercury. You HAVE to run the piss out of them every time you take 'em out, or they run bad. JohnnyRude motors run too good, never need the piss run out of them. Mercury gives me a valid reason to run the snot out of my outboards http://www.checkmate-boats.com/6/ws/,s,8626072361/Graemlins/thumb.gif

Checkmates owned: 1995 Pulsare 2100BR/1995 Mercury Promax 225 2.5 EFI. 1995 Persuader 183/4.3 LX V6. 1992 Pulse 171/1992 Mercury XR6 150 hp 2.5 liter.

F150GT

10-06-2003, 10:26 PM

I guess thats why I love my YAMMY, it runs strong whenever I want it. of course that dosent stop me from running the piss out of it any chance I get.
"love to hear them scream"