Champion Spark Plugs Spark Plug 415

Champion 415 RN9YC Copper Plus Marine Spark Plug

The Champion 415 RN9YC Copper Plus Marine Spark Plug is a standard replacement spark plug for compatible marine engine applications requiring an RN9YC plug. Its copper core center electrode provides reliable conductivity and helps maintain accurate heat control for consistent performance and wear.

This resistor-type spark plug features a nickel-copper alloy ground electrode and Champion's corrosion-resistant TinTac and ULTRASEAL shell coatings. The flat-seat design uses an included crush washer, while the removable terminal nut accommodates compatible ignition connections.

Product Features

Champion Copper Plus standard replacement spark plug

Copper core center electrode supports conductivity and heat control

Resistor design helps suppress electromagnetic and radio-frequency interference

Nickel-copper alloy ground electrode with a single-electrode design

TinTac and ULTRASEAL shell coatings help resist corrosion

Flat seat with included crush washer

Removable terminal nut

Built to applicable ISO and SAE performance standards

Spark Plug Specifications

Champion Part Number: 415

Plug Type: RN9YC

Manufacturer Heat Range: 9

Pre-Gap: 0.032 in. (0.82 mm)

Thread Diameter: 14 mm

Reach: 0.750 in.

Hex Size: 0.813 in. (20.65 mm)

Seat Type: Flat

Resistor Plug: Yes

Ground Electrode Quantity: 1

Fitment Note: Spark plug requirements and installed gap can vary by engine. Verify RN9YC compatibility and the required spark plug gap using the engine manufacturer's service information before installation.

Frequently Asked Questions

• What is the Champion 415 RN9YC Copper Plus Marine Spark Plug used for? The Champion 415 RN9YC Copper Plus Marine Spark Plug is a standard replacement spark plug for compatible marine engine applications requiring an RN9YC plug. Its copper core center electrode provides conductivity and heat control, while the resistor design helps suppress electromagnetic and radio-frequency interference.
• What is the correct gap for the Champion 415 RN9YC Spark Plug? The Champion 415 RN9YC Spark Plug has a listed pre-gap of 0.032 inches (0.82 mm). However, the required installed gap can vary by engine. Verify the correct spark plug gap using the engine manufacturer's service information before installation rather than assuming the listed pre-gap is the required setting.
• What are the specifications of the Champion 415 RN9YC Marine Spark Plug? The Champion 415 RN9YC has a manufacturer heat range of 9, 14 mm thread diameter, 0.750-inch reach, and 0.813-inch (20.65 mm) hex size. It has a flat seat, one ground electrode, a resistor design, and a listed pre-gap of 0.032 inches (0.82 mm).
• Does the Champion 415 RN9YC Spark Plug include a crush washer? Yes. The Champion 415 RN9YC Copper Plus Marine Spark Plug uses a flat-seat design with an included crush washer. It also has a removable terminal nut for compatible ignition connections.
• Is the Champion 415 RN9YC Spark Plug corrosion resistant? The Champion 415 RN9YC features TinTac and ULTRASEAL shell coatings that help resist corrosion. It also uses a nickel-copper alloy ground electrode. These features are part of the spark plug's specified construction for compatible marine engine applications.
• How do I verify that the Champion 415 RN9YC is the correct spark plug for my marine engine? Verify that your engine requires an RN9YC spark plug and confirm the required spark plug gap using the engine manufacturer's service information before installation. Spark plug requirements and installed gap can vary by engine, so the supplied specifications should not be used as a substitute for engine-specific service information.