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.020
0.020 in.
The points gap on a Merc 40 4hp is .020
A Mercury outboard will run well with a plug gap of .035 - .040 in.
Set the gap at .035 in. for a 115 Mercury.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
The maker points in a 1967 model, 110 Mercury outboard, are gapped to .020 in.
The plug gap for a 9.9hp Mercury outboard, ( all models ), is .035 - .040in.
The correct maker point gap setting on the 1972 model, 20 hp Mercury outboard is .020in.
The plug gap for the 1990 model, 100 hp Mercury outboard is .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?