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NGK 5629 Spark Plug
| Brand | NGK 5629 |
|---|---|
| Resistance | 1 |
| 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 | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 18 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 12.00 |
| Part Number | Dp7ea-9 |
| Stock Number | 5629 |
| Fits | — |
OE supplier heritage. Backed by NGK's long-standing original equipment standards.
Copper core design. Helps promote reliable ignition performance and durability.
Standard spark plug. A direct-fit replacement for many ignition applications.
Cross-references DENSO Auto Parts 4085, Monroe Shocks & Struts 5629 and OSC 4209 for the same application. See all 15.
NGK DP7EA-9 Spark Plug for Reliable Ignition
The NGK Standard Spark Plug, part number 5629, is built for dependable ignition performance in a wide range of domestic and import applications. With a copper core center electrode, nickel tip materials, and a standard ground configuration, this spark plug supports consistent combustion and stable engine operation.
NGK’s Standard Spark Plug line focuses on OE-style construction and broad vehicle coverage. The DP7EA-9 design reflects NGK’s long history as an OE supplier, with manufacturing standards aimed at durability and consistent performance for automotive, motorcycle, marine, and small engine use.
Key Features
- NGK Standard Spark Plug, part number 5629
- DP7EA-9 service part number
- Copper center electrode core with nickel tip material
- Nickel ground electrode core with standard ground design
- 1 ohm resistance for ignition system compatibility
- Pre-gapped at .036 inch
- 12 mm thread diameter, .75 inch reach, flat seat
- 18 mm hex size and stud terminal type
- Manufacturer heat range 7
Detailed Description
NGK 5629 is a standard spark plug engineered with a copper core center electrode and nickel electrode materials to support steady spark delivery and dependable combustion. The flat seat, .75 inch reach, 12 mm thread diameter, and .036 inch pre-gap make it a practical OE-style replacement for service work where correct plug dimensions matter. This part is identified as DP7EA-9 and is commonly searched as NGK DP7EA-9 or NGK 5629 for ignition maintenance on motorcycle and small engine applications, as well as select automotive uses. This part cross-references DENSO Auto Parts (e.g., 4085) for the same application.
Common Issues It May Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle from weak or inconsistent spark output
- Misfire conditions related to aged ignition components
- Poor throttle response from degraded plug performance
- Reduced combustion efficiency in routine tune-up service
Installation Notes and Tips
Verify thread diameter, reach, seat type, and heat range before installation to confirm the correct application. Check the gap against engine specifications before use, even when the plug is pre-gapped. Use proper torque procedures and inspect the ignition system, including wires, coils, and terminals, when replacing spark plugs. Search terms such as NGK 5629 spark plug, DP7EA-9 replacement, and NGK spark plug for motorcycle or small engine service are commonly used when sourcing this part.
Quality Assurance
NGK is a long-established OE supplier with North American manufacturing, inventory, and distribution support. The brand’s Standard Spark Plug line is built to original equipment standards for consistent durability and operational performance.
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