Champion 509 Spark Plug

Champion Copper Plus 509 Spark Plug

Champion Copper Plus 509 is an industrial and agricultural spark plug built for high-temperature, high-load 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 demanding equipment.

Key Features

• Champion Copper Plus line for industrial and agricultural ignition service
• Part number 509 for direct catalog identification
• Nickel center electrode tip and nickel ground electrode core material
• Nickel copper alloy ground electrode material for durable spark delivery
• 0.025 in. pre-gap size for specified ignition setup
• Flat seat design with 0.5 in. reach
• 18 mm thread diameter and 0.875 in. hex size
• Non-resistor construction with removable nut terminal

Product Details

The Copper Plus product line focuses on dependable ignition performance in equipment that sees sustained heat and load. Champion 509 uses a D9 plug type, a 9 heat range, and a single ground electrode configuration to support stable combustion in engines that require a conventional copper-core style spark plug. The removable nut terminal helps with common ignition wire setups, while the flat seat and standard thread dimensions support proper cylinder head sealing when matched to the correct application.

For buyers searching for Champion 509 spark plug, Champion Copper Plus 509, or industrial spark plug replacement for agricultural equipment, this plug is built around the core specifications that matter most: reach, thread size, seat type, and electrode material. It is also a relevant search match for equipment owners looking for ignition service parts for Champion agricultural plugs and related D9 applications.

This part cross-references Autolite 373 and Champion Spark Plug 82 for the same application.

Common Issues It Can Address

• Hard starting caused by worn or fouled spark plugs
• Weak ignition output in high-load operating conditions
• Misfire from excessive electrode wear
• Inconsistent combustion from incorrect plug gap
• Service replacement needs for industrial and agricultural engines

Installation Notes and Tips

Verify the plug type, thread diameter, reach, seat style, and heat range before installation. Confirm the 0.025 in. gap specification against the engine requirement and inspect the ignition lead connection to ensure the removable nut terminal is seated correctly. For vehicle and equipment searches such as Champion 509 spark plug for tractor ignition service or Champion Copper Plus 509 for industrial engine maintenance, always match the plug to the exact engine specification before use.

Quality Assurance

Champion states that its industrial and agricultural spark plugs are supported by global engineering from Federal-Mogul and are developed for demanding service environments with high temperature and load.