The factory specified plug brand and type will be on the small spec stamp or sticker on the motor once you remove the cowling. Take the cowling/cover off and search for it. It has the engine serial, model #, spark plug, gap, and other useful information that will aide you when performing maintenance or repairs.
If the sticker or stamp is no longer legible, call your local Merc dealer and ask for the specs -- but be sure you have the motor serial # handy so that they can help you.
The plugs you are looking for run about $19-$22 EACH and are NGKs. I don't remember the particular part number/plug number, but I do know that you will spend a little money for them.
Also, with the OptiMax -- don't try to substitute a cheap plug in place of the expensive plugs. That particular type is stamped on the spec sticker for a reason.......One more thing, set your torque wrench to 20lbs when putting the new ones back in. Mercury calls for this amount of pressure so that the anode on the plug is in alignment with specification.
Originally Posted by Shimano4Life
The factory specified plug brand and type will be on the small spec stamp or sticker on the motor once you remove the cowling. Take the cowling/cover off and search for it. It has the engine serial, model #, spark plug, gap, and other useful information that will aide you when performing maintenance or repairs.
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