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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 spark plug gap for a 9.9hp mercury outboard motor
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?
The correct spark plug gap for the 1982 model, 9.8 hp Mercury outboard is .040 in.
NGK BPR6HS-10 spark plug. Gap is .040
The plug gap for a 9.9hp Mercury outboard, ( all models ), is .035 - .040in.
The recommended gap is .025"
.030 gap
.035
.040