There are none. I believe they use a perma gap plug.
The plug gap for a 1995 model, 40 hp Mercury is .035 in.
The correct spark plug gap for the 1982 model, 9.8 hp Mercury outboard is .040 in.
What is the spark plug gap for a 9.9hp mercury outboard motor
is 54 gap for a spark plug mercury mountanier 2002 4.6
The 1999 Mercury Tracer was the last model year in North America ( according to one of Fords websites , .054 inch is the spark plug gap on the 1999 Mercury Tracer )
The 1991 Mercury Marquis spark plug gap is .034. Most spark plugs will be pre-gapped by the spark plug manufacturer.
The 1997 model Mercury, 225 hp EFI uses a NGK BR8HS plug, gapped to .035 in.
The recommended spark plug for the 1996 model, carbureted 150 hp Mercury outboard is an NGK BU8H. This is a Perma-Gap type plug, so no gap setting required.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
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.
NGK BPR6HS-10 spark plug. Gap is .040
A Mercury outboard will run well with a plug gap of .035 - .040 in.