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The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
spark plug gap for a 1996 mercury 30 hp outboard motor?
What is the spark plug gap for a 9.9hp mercury outboard motor
.020
0.020 in.
.040
NGK BPR6HS-10 spark plug. Gap is .040
The points gap on a Merc 40 4hp is .020
A Mercury outboard will run well with a plug gap of .035 - .040 in.
40
Set the gap at .035 in. for a 115 Mercury.
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.