The spark plug gap for a 4.5 Mercury outboard motor is typically set between 0.030 to 0.040 inches. It’s important to check the owner’s manual or service manual for specific recommendations, as gaps can vary based on engine year and model. Proper gap adjustment ensures optimal engine performance and efficient ignition. Always use the correct spark plugs specified for your outboard.
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
spark plug gap for a 1996 mercury 30 hp outboard motor?
What is the correct spark plug gap setting for a Mercury outboard 2003 200 HP EFI
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