Champion Copper Plus Spark Plug Nickel, Pack of 8Champion marine spark plug L77JC4. Champion marine spark plugs are specifically designed to resist potential salt and spray damage and corrosion. Many models use special resistors to prevent radio interference and damage to the CDI ignition systems often used in outboard motors. Champion copper plus spark plug technology began as an automotive OE plug and today is widely used in a variety of power equipment applications The nickel alloy center and