NGK 5255 Spark Plug

NGK Laser Platinum Spark Plug 5255

The NGK Laser Platinum Spark Plug 5255 is a direct-fit ignition component for select Mazda RX-7 applications. Built with a platinum center electrode, nickel ground electrode core, and a 5,000 ohm resistor, it supports stable spark delivery and consistent secondary ignition performance.

Key Features

• Laser Platinum spark plug from NGK
• Part number 5255, also identified as BUR9EQP
• Platinum center electrode tip material for durable spark performance
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core with surface discharge design
• 5,000 ohm resistance for ignition noise suppression
• 14.00 mm thread diameter, 21.5 reach, 13/16 hex size
• Flat seat design with non-removable nut terminal
• Pre-gapped at .056

Product Details

NGK 5255 is part of the Laser Platinum line, a spark plug family built around OE-style construction and consistent performance standards. NGK supplies ignition components for a wide range of domestic and import vehicles, and this plug reflects that background with a platinum-tipped center electrode, surface discharge ground configuration, and heat range 9 specification. For Mazda RX-7 owners, NGK 5255 is listed for trailing plug applications on 1986-1991 models and 1993-1995 models, with an additional optional cold climate application for 1984-1985 RX-7 models.

This part cross-references 0000-18-N3A1 and 1765256 for the same application.

Used For

• Replacing worn spark plugs in Mazda RX-7 trailing ignition positions
• Restoring weak spark caused by electrode wear
• Addressing rough idle related to plug degradation
• Correcting misfire conditions tied to ignition wear
• Maintaining proper combustion performance in service intervals

Installation Notes

Verify the application by year and engine configuration before installation. This plug is listed for trailing positions on 1986-1991 Mazda RX-7 and 1993-1995 Mazda RX-7 models, and for 1984-1985 Mazda RX-7 as an optional cold climate spark plug. Confirm the specified gap of .056 before use and follow the vehicle service procedure for torque and ignition system inspection.

• Fits 1993-1995 Mazda RX-7, trailing
• Fits 1986-1991 Mazda RX-7, trailing
• Fits 1984-1985 Mazda RX-7, optional cold climate spark plug

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. The brand’s manufacturing focus on original equipment standards supports durability and consistent operational performance across its ignition product range.