Champion 859 Spark Plug

Champion Copper Plus 859 Spark Plug

Champion Copper Plus 859 is a small engine spark plug built for dependable ignition performance and steady heat control. Its copper core electrode improves conductivity, while nickel construction at the center and ground electrodes supports consistent wear in secondary ignition service.

For buyers searching Champion 859 spark plug replacement, this RCJ7Y plug is a practical OE-style choice for small engine ignition maintenance. It is also a useful cross-reference for applications calling for RCJ7Y, including select Honda Civic and Toyota Corolla search terms where the same plug specification is referenced.

Key Features

• Copper core electrode for improved conductivity and heat control
• Nickel center electrode tip and nickel ground electrode materials
• Resistor design for reduced electrical noise
• Flat seat design with a 0.375-inch reach
• 14 mm thread diameter and 19 mm hex size
• Pre-gapped to 0.025 in. / 0.65 mm
• Champion Copper Plus small engine classification
• Plug type RCJ7Y

Product Details

Champion Copper Plus 859 is engineered around a copper core for stable spark delivery and heat management, which helps maintain reliable ignition performance under regular operating conditions. The nickel electrode materials and resistor construction support clean operation in secondary ignition systems, while the flat seat and standard thread dimensions make it straightforward to match against OE-style specifications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire symptoms tied to weak ignition output
• Reduced engine responsiveness from degraded plug performance
• Maintenance replacement for RCJ7Y-spec ignition service

Installation Notes and Tips

Verify the plug type, thread diameter, reach, seat style, and heat range before installation. Check the gap against the engine specification even though the plug is pre-gapped at 0.025 in. / 0.65 mm. Use the correct hex size during removal and tightening, and confirm the terminal style matches the ignition lead or boot connection.

Compatible With select Honda Civic and Toyota Corolla applications when the required specification is RCJ7Y. Fits 2006-2011 Honda Civic, front right is not stated in the fitment data and should not be assumed; confirm the exact engine application before ordering. Champion 859 is also searched as a replacement spark plug for RCJ7Y small engine and automotive cross-reference needs.

Quality Assurance

Champion’s Copper Plus line focuses on dependable performance through copper-core conductivity and controlled heat transfer. The 859 spark plug is built to the listed specifications for accurate replacement matching in ignition service.