What is Spark plug gap on 4.5 mercury outboard?

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.