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NGK 4549 Spark Plug
| Brand | NGK 4549 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | .028 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | .5 |
| Thread Diameter | 10.00 |
| Part Number | Cr7hsa |
| Stock Number | 4549 |
| Fits | — |
OE legacy. Built to original equipment standards for dependable performance.
Copper core. Helps promote consistent ignition and reliable operation.
Standard design. Spark plug with nickel electrodes and a flat seat.
Cross-references Airtex Fuel Pumps 4008, Champion Spark Plug 808 and NGK 4549 for the same application. See all 21.
NGK CR7HSA Spark Plug
NGK 4549 is a standard spark plug built for reliable ignition performance in small-engine and powersports applications. This NGK Standard Spark Plug uses a copper center electrode core, nickel center and ground electrode tips, and a 5,000 ohm resistor to help maintain stable spark delivery.
Compatible With Honda and Yamaha applications that call for NGK CR7HSA, this plug is specified with a 10 mm thread diameter, 5/8 hex, .500 reach, flat seat, and .028 pre-gap. The NGK 4549 part number is also listed as CR7HSA for easy cross-reference.
Key Features
- NGK Standard Spark Plug, part number 4549
- CR7HSA replacement reference
- 5000 ohm resistor for ignition circuit control
- Copper core center electrode with nickel tip
- Nickel ground electrode with standard configuration
- .028 pre-gap, 10 mm thread diameter, 5/8 hex
- Flat seat and .500 reach
Product Details
NGK builds this spark plug to OE-style specifications for consistent ignition performance and durability. The standard electrode design, nickel construction, and stud terminal support dependable spark transfer in engines that require the CR7HSA heat range 7 configuration. For buyers searching NGK 4549, CR7HSA spark plug, or Honda/Yamaha spark plug replacement, this part matches the listed dimensions and electrical specifications.
This part cross-references Champion Spark Plug 808 for the same application.
Common Issues It Can Help Address
- Hard starting caused by worn spark plug electrodes
- Misfire from excessive plug gap or degraded ignition transfer
- Rough idle from inconsistent spark output
- Reduced throttle response from an aging plug
- Ignition performance loss in engines calling for CR7HSA
Installation Notes
Verify the engine calls for NGK CR7HSA before installation. Confirm thread diameter, reach, seat type, and pre-gap against the service specification for your Honda, Yamaha, or other listed application. Check the gap during service and install to the manufacturer’s torque specification.
Quality Assurance
NGK is a major OE spark plug supplier with more than 80 years of automotive experience and broad coverage across automotive, motorcycle, marine, and small-engine applications. The 4549 spark plug is manufactured to support original-equipment standards for durability and operational performance.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||