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NGK 6544 Spark Plug
| Brand | NGK 6544 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Taper cut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Imr9d-9h |
| Stock Number | 6544 |
| Fits | — |
Laser iridium design. Iridium tip and copper core for precise ignition performance.
OE supplier heritage. Built by NGK, a long-time original equipment spark plug manufacturer.
Standard spark plug. Flat seat and non-removable nut for a straightforward replacement.
Cross-references NGK 6544 and 31911-HW1-671 for the same application. See all 2.
NGK Laser Iridium Spark Plug 6544
NGK 6544 is a Laser Iridium spark plug built for precise ignition performance in applications that call for a 10 mm, flat-seat plug with a .75 reach and .036 pre-gap. It uses an iridium center electrode tip, a nickel ground electrode, and a 5000-ohm resistor to support stable spark delivery and consistent engine operation.
Key Features
- Laser Iridium design with an iridium center electrode tip for durable spark performance
- 5000-ohm resistor helps control electrical noise in the ignition system
- Flat seat, 10.00 mm thread diameter, and .75 reach for the specified application
- .036 pre-gap for OE-style ignition setup
- Nickel ground electrode with taper-cut tip design
- Non-removable nut terminal for secure connection
- Cross-reference part number: IMR9D-9H
Product Details
This NGK Laser Iridium Spark Plug is part number 6544 and is identified by stock number 6544. NGK’s Laser Iridium line focuses on OE-level construction and consistent ignition characteristics, making it a practical choice for drivers who need a direct-replacement spark plug with the correct heat range, terminal style, and electrode configuration. It is a fitment-specific ignition component for vehicles such as Honda Civic and Honda models that call for this exact plug specification.
Compatible With Honda Civic and other Honda applications that specify NGK 6544 / IMR9D-9H, this spark plug supports reliable combustion, clean starting, and steady idle quality when the engine is tuned for the listed dimensions and heat range. The copper core center electrode and iridium tip work together to promote efficient spark transfer under normal operating conditions.
What It Helps Address
- Rough idle caused by worn or incorrect spark plugs
- Hard starting from weak or inconsistent ignition output
- Misfire conditions related to plug wear or improper gap
- Reduced throttle response from degraded spark quality
- Ignition noise concerns in systems that require a resistor plug
Installation Notes
Verify the engine calls for a 10 mm, flat-seat spark plug with a .75 reach, .036 pre-gap, and 5/8 hex before installation. Check the service manual for the correct torque specification and confirm the ignition system is in good condition before installing NGK 6544. For Honda Civic and related Honda applications, match the plug number and heat range exactly to the OE requirement.
Quality Assurance
NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience. The brand’s OE-focused production and broad vehicle coverage support consistent part quality for applications that specify NGK 6544.
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