Champion 555 Spark Plug

Champion Copper Plus Spark Plug Overview

The Champion Copper Plus spark plug, part number 555, is designed for reliable ignition performance in agricultural and light-duty engines. Featuring a nickel center electrode and a nickel copper alloy ground electrode, this spark plug supports consistent combustion and engine efficiency.

• Ground electrode core material: Nickel
• Center electrode tip material: Nickel
• Pre-gap size: 0.025 inches (0.65 mm)
• Single ground electrode with nickel copper alloy
• Flat seat type with 0.5 inch reach
• Thread diameter: 0.709 inch (18 mm)
• Heat range: 16 (manufacturer specified)
• Removable nut electrical terminal
• Hex size: 0.875 inch (22.23 mm)
• Center electrode diameter: 0.125 inch
• Installed height: 2.25 inches
• Plug type: UD16

Details on Champion Copper Plus Spark Plug

The Champion Copper Plus line is engineered to provide dependable ignition with a copper core for enhanced conductivity and heat dissipation. The part number 555 spark plug incorporates a nickel center electrode and a nickel copper alloy ground electrode, which contribute to durability and stable spark performance. Its flat seat design and 0.5 inch reach make it suitable for specific agricultural engines requiring precise fitment. The removable nut terminal allows for easier installation and maintenance.

Applications and Common Issues Addressed

• Restores proper ignition in agricultural engines with worn or fouled plugs
• Helps reduce misfires caused by inconsistent spark delivery
• Improves cold start performance in compatible vehicles
• Addresses rough idling due to electrode wear or gap inconsistencies
• Supports efficient fuel combustion to maintain engine power

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 0.025 inches (0.65 mm) before installation. Use a torque wrench to tighten the plug to manufacturer specifications to avoid damage to the flat seat or threads. The 0.709 inch (18 mm) thread diameter and 0.5 inch reach require compatibility verification with your engine model. The removable nut terminal facilitates connection to ignition wires, but verify secure attachment to prevent electrical issues.

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet industry standards for ignition components. The part number 555 is classified under Champion agricultural plugs, ensuring suitability for specific agricultural engine applications. While no specific warranty details are provided, Champion products typically adhere to quality control processes to maintain consistent performance and reliability.