The plug gap for the 1990 model, 100 hp Mercury outboard is .040 in.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
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?
A Mercury outboard will run well with a plug gap of .035 - .040 in.
NGK BPR6HS-10 spark plug. Gap is .040
What is the spark plug gap for a 9.9hp mercury outboard motor
Johnson 6hp spark plug gap
The required spark plug for a 50 hp outboard engine would depend on the make, and year model of the engine.
The 1998 model, Yamaha 250 hp outboard, requires an NGK BR9HS-10 spark plug, gapped to .039 in.
The 25 hp Johnson outboard runs a plug gap of .030 in.
The plug gap for a 1995 model, 85 hp Suzuki outboard is .039 in.