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NGK 4578 Spark Plug
| Brand | NGK 4578 |
|---|---|
| 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 | .032 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Cr7e |
| Stock Number | 4578 |
| Fits | — |
Standard spark plug. Copper core and nickel electrodes for reliable ignition performance.
OE supplier heritage. Built by NGK, a long-time original equipment manufacturer.
Standard design. Flat seat and standard ground configuration for straightforward replacement.
Cross-references AMS Automotive 4578, Anchor 8698 and Autolite 4303 for the same application. See all 24.
NGK CR7E Standard Spark Plug
NGK CR7E 4578 is a standard spark plug built for reliable ignition performance in a wide range of motorcycles, marine engines, and small engine applications. As part of NGK’s Standard Spark Plug line, it combines a copper core center electrode, nickel tip materials, and a 5,000 ohm resistor for stable operation and consistent spark delivery.
Key Features
- Part number CR7E, stock number 4578
- Standard spark plug design for OE-style replacement service
- Copper core center electrode for efficient heat transfer
- Nickel center and ground electrode tip materials
- 5,000 ohm resistance for ignition noise suppression
- Pre-gapped to .032 inch
- Flat seat design with .75 inch reach
- 10 mm thread diameter and 5/8 inch hex size
- Heat range 7 for specified engine applications
Product Details
NGK’s Standard Spark Plug line is built around original equipment standards and broad application coverage. The CR7E 4578 uses a stud terminal, standard ground configuration, and a single nickel ground electrode to support dependable combustion in engines that call for this specification. For riders and technicians searching for NGK CR7E spark plug replacement options, this plug is a direct match to the listed dimensions and electrical characteristics.
This part cross-references Champion Spark Plug 654 and DENSO Auto Parts 4174 for the same application. Search terms such as NGK CR7E 4578 spark plug, CR7E replacement spark plug, and NGK motorcycle spark plug are commonly used for this part.
Common Issues This Spark Plug Can Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle from inconsistent ignition firing
- Misfire symptoms tied to weak spark delivery
- Reduced throttle response from degraded plug performance
- Ignition noise concerns in specified electrical systems
Installation Notes and Tips
Verify the engine calls for NGK CR7E specifications before installation. Check the pre-gap measurement, thread diameter, reach, seat type, and heat range against the service manual for the exact make and model. Use proper spark plug service procedures, and confirm the terminal style matches the ignition lead or coil connection. Fits are application-specific; confirm the vehicle listing before ordering for Honda Civic, Yamaha motorcycle, or other CR7E-equipped applications.
Quality Assurance
NGK is a long-established OE supplier with extensive coverage across automotive, motorcycle, marine, and small engine markets. The CR7E 4578 is manufactured to support original equipment standards for durability and consistent operational performance.
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