Champion 561 Spark Plug

Champion Copper Plus 561 Spark Plug

Champion Copper Plus 561 is an agricultural and industrial spark plug built for demanding secondary ignition service. It uses nickel center and ground electrode materials, a flat seat, and a 0.025 in. pre-gap to support consistent ignition performance in high-temperature, high-load environments.

The Copper Plus line focuses on dependable copper-core style performance for equipment that needs stable spark delivery and straightforward service replacement. Part number 561 is also identified as plug type W16Y, making it a direct reference point for maintenance on compatible applications.

Key Features

• Champion Copper Plus spark plug for secondary ignition systems
• Nickel center electrode tip material and nickel ground electrode core material
• Pre-gapped at 0.025 in. (0.65 mm)
• Flat seat design with 0.625 in. reach
• 0.875 in. thread diameter and 0.938 in. hex size
• Non-resistor design
• Manufacturer heat range 16
• Plug type W16Y

Product Details

Champion part number 561 is engineered for industrial and agricultural use where ignition stability matters under sustained load. The nickel electrode construction supports reliable spark transfer, while the flat-seat configuration and specified thread dimensions help ensure proper installation in the correct cylinder head design. If you are searching for a Champion 561 spark plug, W16Y spark plug, or a Copper Plus replacement for agricultural equipment, this part provides the core specifications needed for a direct match.

This part cross-references Gates A44 for the same application.

Common Issues It May Address

• Hard starting caused by worn or fouled spark plugs
• Misfire from inconsistent spark delivery
• Rough idle in equipment with aging ignition components
• Reduced combustion efficiency under load
• Service replacement needs for compatible Champion agricultural plug applications

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Champion 561 uses a 0.025 in. pre-gap, but the gap should still be checked against the engine or equipment specification before use. Confirm the plug type W16Y and compare the old plug’s dimensions to the replacement part to ensure proper fitment.

For fitment-based searches, this spark plug is commonly referenced for Champion 561 spark plug replacement, W16Y spark plug replacement, and agricultural ignition service on compatible equipment. It is also a relevant search term for users looking for a Champion Copper Plus plug for industrial and agricultural engines.

Quality Assurance

Champion states that its industrial and agricultural spark plugs are supported by global engineering from Federal-Mogul and are built for high-temperature, high-load service environments. The Copper Plus line is designed around durable nickel electrode construction and established plug specifications for dependable maintenance replacement.