NGK 5940 Spark Plug

NGK BR10ECS SOLID Spark Plug

NGK 5940 is a Standard Spark Plug built for dependable ignition performance in a wide range of domestic and import applications. It features a copper core center electrode, nickel center tip, nickel ground electrode, and a 5,000 ohm resistor for stable spark delivery and reduced electrical noise.

As part of NGK’s Standard Spark Plug line, this plug reflects the brand’s OE-focused manufacturing approach and long-standing coverage across automotive, motorcycle, marine, and small engine applications. For buyers searching for NGK 5940 spark plug replacement or BR10ECS SOLID ignition service parts, this is a direct-fit style plug with a flat seat, 14 mm thread diameter, .75 reach, and .032 pre-gap.

Key Features

• NGK Standard Spark Plug, part number 5940
• BR10ECS SOLID configuration with 13/16 hex size
• Copper core center electrode for consistent heat transfer
• Nickel center and ground electrode materials
• 5,000 ohm resistor for ignition system noise suppression
• Flat seat design with .75 reach and 14 mm thread diameter
• Pin-type ground electrode tip with slant ground configuration
• Pre-gapped to .032

Product Details

NGK 5940 is engineered as a standard replacement spark plug for engines that call for the BR10ECS SOLID specification. The copper core helps manage heat, while the nickel electrode materials support reliable spark transfer under normal operating conditions. The 10 heat range, non-removable nut terminal, and flat seat design make this plug a practical choice for routine ignition service where OE-style dimensions matter.

For shoppers comparing NGK spark plug 5940 against other ignition parts, this model is commonly searched for Honda Civic spark plug replacement and similar vehicle maintenance needs. It is also referenced under BR10ECS SOLID when matching service parts by specification.

This part cross-references Hayden 5940 for the same application.

Common Issues It May Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire symptoms related to aged plugs
• Reduced throttle response from weak spark delivery
• Ignition noise concerns in serviced electrical systems

Installation Notes and Tips

Verify the engine calls for a 14 mm, flat-seat spark plug with .75 reach and a .032 gap before installation. Check the existing plug specification against BR10ECS SOLID and confirm the heat range matches the application. Use proper torque procedures and inspect ignition wires or coils during service to avoid repeat misfire concerns. For Honda Civic spark plug service or other NGK 5940 applications, confirm cylinder head thread condition before threading the plug in by hand.

Quality Assurance

NGK is a major OE spark plug supplier in North America and manufactures ignition components to original equipment standards. The brand’s long automotive history and broad application coverage support consistent product quality for routine maintenance and replacement service.