NGK 6289 Spark Plug

NGK Laser Iridium Spark Plug 6289 Overview

NGK Laser Iridium Spark Plug 6289 is a direct-fit ignition component built around an iridium center electrode, a nickel ground electrode, and a 5,000 ohm resistor for stable secondary ignition performance. The CR9EIA-9 design uses a flat seat, 10.00 mm thread diameter, .75 reach, and .036 pre-gap size for applications that call for this exact specification.

As part of NGK’s Laser Iridium Spark Plug line, this plug reflects the brand’s OE-focused manufacturing approach and long-standing coverage across domestic and import vehicles, including motorcycle, marine, and small engine applications. For buyers searching for NGK 6289 or CR9EIA-9, this part is built to match the required heat range and terminal style for the specified application.

Key Features

• NGK Laser Iridium Spark Plug, part number 6289
• CR9EIA-9 service part number for application matching
• Iridium center electrode tip for precise spark delivery
• Copper core center electrode for heat transfer
• Nickel ground electrode with taper cut tip design
• 5,000 ohm resistor for ignition noise suppression
• Flat seat, 10.00 mm thread diameter, .75 reach
• Pre-gapped to .036 with a stud terminal
• Heat range 9 for specified engine requirements

Product Details

NGK 6289 is engineered as a Laser Iridium spark plug for engines that require the CR9EIA-9 specification. The iridium center electrode supports consistent ignition performance, while the nickel ground electrode and standard ground configuration follow the original equipment-style layout used in many performance and import applications. If you are sourcing a replacement spark plug for a Honda Civic or similar vehicle application that calls for this exact plug specification, NGK 6289 provides the correct dimensions and terminal style for proper service.

This part cross-references FEL-PRO 5390 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Misfire conditions related to plug wear or incorrect heat range
• Reduced throttle response from degraded ignition performance
• Ignition noise concerns in systems requiring a resistor plug

Installation Notes and Tips

Verify the required plug code, thread diameter, reach, seat type, and heat range before installation. Confirm the gap specification against the vehicle service information, even though this plug is pre-gapped to .036. Use the correct 5/8 hex socket and tighten to the manufacturer’s torque specification for the engine. For fitment-based searches, confirm the exact application before ordering NGK 6289 or CR9EIA-9, especially on Honda Civic and other import vehicle platforms that use this plug design.

Quality Assurance

NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience and broad coverage across vehicle applications. The brand’s OE-oriented production standards and global distribution network support consistent part quality for service replacement needs.