Champion 104 Spark Plug

Champion Copper Plus 104 Spark Plug

Champion Copper Plus 104 is a resistor spark plug built for dependable ignition performance in small engine and select automotive applications. Its copper core electrode improves conductivity and heat control, while the nickel center and ground electrode materials support consistent wear characteristics.

The Copper Plus line focuses on practical, OE-style ignition service with a copper core design that helps maintain stable firing performance. For shoppers searching for a Champion RN4C spark plug or Champion 104 replacement, this plug matches the RN4C plug type and is listed for applications including Volkswagen Vanagon, Honda Accord, Honda Prelude, and Chevrolet Corvette.

Key Features

• Copper core electrode for improved conductivity and heat control
• Resistor type spark plug for ignition system noise suppression
• Nickel center electrode tip and nickel ground electrode core material
• Flat seat design with 0.75 in reach and 14 mm thread diameter
• Pre-gapped at 0.025 in / 0.64 mm
• Champion Copper Plus Small Engine classification
• Plug type RN4C with removable nut terminal

Detailed Description

Champion 104 is a Copper Plus spark plug engineered around a copper core electrode to improve electrical conductivity and manage heat transfer during operation. The nickel-based electrode construction supports steady spark delivery and normal wear in service, while the resistor design helps reduce electrical interference in the ignition system. With a flat seat, 14 mm thread diameter, 0.75 in reach, and RN4C plug type, this spark plug is built to match the listed OE-style applications.

Fitment includes 1984-1991 Volkswagen Vanagon, 1979-1980 Honda Accord, 1979-1980 Honda Prelude, and 1969 Chevrolet Corvette with aluminum head. This part cross-references NGK 4922 and Autolite 404 for the same application. If you are replacing a Champion 104 spark plug in a Volkswagen Vanagon or looking for a Champion RN4C replacement for a Honda Accord or Honda Prelude, this listing provides the core specifications needed for a direct match.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire conditions related to weak ignition output
• Rough idle from degraded plug electrodes
• Reduced combustion efficiency from excessive plug wear
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify the plug type, thread diameter, reach, seat style, and gap before installation. The pre-gap is listed at 0.025 in / 0.64 mm, but several fitments note different OE gap specifications, so confirm the required gap for your exact engine before use. Check the terminal style and ensure the removable nut configuration matches your ignition lead or coil connection.

Quality Assurance

Champion Copper Plus plugs are built with a copper core design for dependable conductivity and heat control, along with nickel electrode materials for consistent service life. Use the listed fitment and specifications to confirm application before installation.