I have an early 90's 2cyl, 8hp, 2-stroke and the gap is .040.
The plug gap for a 9.9hp Mercury outboard, ( all models ), is .035 - .040in.
The correct spark plug for the 1991 model, 200 hp Mercury outboard, is a NGK brand, BU8H.
The correct spark plug gap for the 2004 model, 40 hp Mercury outboard 2 stroke is .040 in.
40
The recommended spark plug for a 1992 model, 200hp Mercury 2 stroke carbureted outboard, is an NGK BU8H. This is a perma-gap type plug, so no gap setting is required.
The 2006 model, 60 hp Mercury outboard 2 stroke requires a NGK BPZ8H-N-10. The 4 stroke model requires an NGK DCPR7E.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
A Mercury outboard will run well with a plug gap of .035 - .040 in.
What is the correct spark plug gap setting for a Mercury outboard 2003 200 HP EFI
spark plug gap for a 1996 mercury 30 hp outboard motor?
What is the spark plug gap for a 9.9hp mercury outboard motor
For a 2005, Mercury 3.3 hp outboard, a NGK BPR6HS.