Champion 818 Spark Plug

Champion Copper Plus 818 Spark Plug

Champion Copper Plus 818 is a small engine spark plug built for dependable ignition performance and steady heat control. Its copper core electrode helps improve conductivity, while the nickel center and ground electrode materials support consistent wear characteristics in secondary ignition service.

Key Features

• Copper core electrode for improved conductivity and heat control
• Nickel center electrode tip and nickel ground electrode core material
• Resistor design for reduced electrical noise
• Flat seat with 0.75 in. reach and 14 mm thread diameter
• Pre-gapped at 0.025 in. / 0.65 mm
• Champion Copper Plus small engine classification
• Part number 818, plug type RN2C

Product Details

The Champion Copper Plus line focuses on practical ignition performance with a copper core design that supports conductivity and heat transfer. For small engine applications, that balance can help maintain stable firing characteristics under regular operating conditions. The 818 spark plug also uses a removable nut terminal, a hex-style body, and a resistor configuration for straightforward service in the correct application.

For buyers searching by vehicle or equipment application, Champion 818 is a direct-reference spark plug option for select small engine uses and cross-references with common replacement numbers. This part cross-references NGK 5422 and Bosch 3972 for the same application. If you are comparing Champion 818 against other ignition parts for a Honda Civic or similar engine family, verify the plug type, reach, thread diameter, and seat style before installation.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire concerns related to degraded electrode surfaces
• Rough idle from weak ignition output
• Heat-related plug wear in small engine service
• Electrical interference in resistor-equipped ignition systems

Installation Notes

Confirm the plug type RN2C, 14 mm thread diameter, 0.75 in. reach, and flat seat before installation. Check the pre-gap against the engine specification and adjust only if the application calls for it. Use the correct torque procedure for the cylinder head material and inspect the ignition lead or coil terminal condition during service. For fitment-based searches, this Champion 818 spark plug is commonly referenced alongside Honda Civic and other small engine application queries, but final compatibility must match the engine specification.

Quality Assurance

Champion Copper Plus spark plugs are built around a copper core electrode and nickel electrode materials to support dependable service life and consistent ignition performance in the specified application.