NGK 5777 Spark Plug

NGK BUR9EQ Spark Plug for Mazda RX-7

NGK BUR9EQ is a standard spark plug built for specific Mazda RX-7 trailing applications. It uses a copper center electrode core, nickel center electrode tip, and nickel ground electrode materials to support consistent ignition performance in the specified fitments.

Key Features

• Standard spark plug for ignition service
• Surface discharge ground electrode design
• 5000 ohm resistance
• Copper center electrode core with nickel tip
• Nickel ground electrode core and tip design
• 14.00 mm thread diameter with flat seat
• 13/16 hex size for service access
• Pre-gapped at .056 in. for listed applications
• Manufacturer heat range 9

Product Details

NGK Standard Spark Plug 5777 is engineered for Mazda RX-7 applications that call for a trailing plug configuration. The BUR9EQ part number identifies this plug within NGK’s standard spark plug line, and the design includes a non-removable nut terminal, 21.5 reach, and surface discharge ground configuration. NGK’s long OE supply history and broad automotive coverage support its reputation for precise fitment and consistent manufacturing across domestic and import vehicle applications.

This part cross-references Anchor 3105 and Hayden 2626 for the same application.

Vehicle Fitment

• Fits 1993-1995 Mazda RX-7, trailing; gap 0.056"; standard spark plug.
• Fits 1986-1991 Mazda RX-7, trailing; gap 0.056"; actual OE manufacturer; 30,000 mi OE manufacturer recommended service interval; standard spark plug.
• Fits 1985 Mazda RX-7, optional cold climate spark plug; gap 0.055"; actual OE manufacturer; 30,000 mi OE manufacturer recommended service interval; standard spark plug.
• Fits 1984 Mazda RX-7, optional cold climate spark plug; gap 0.055"; actual OE manufacturer; standard spark plug.

Installation Notes

Verify the trailing plug position and gap specification before installation. Confirm thread diameter, reach, seat type, and terminal style match the vehicle’s ignition requirements. For Mazda RX-7 service, follow the listed gap and application notes for the model year being serviced.

Quality Assurance

NGK is a major OE spark plug supplier with decades of automotive manufacturing experience. The brand’s focus on original equipment standards, durability, and operational performance supports dependable service in Mazda RX-7 ignition maintenance.