/live/media/NG/NG_3129_Fro.jpg)
NGK 3129 Spark Plug
| Brand | NGK 3129 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | .056 |
| Ground Electrode Quantity | 4 |
| Hex Size | 13/16 |
| Insulator Height | 60.00 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 14.00 |
| Part Number | Br9eq-14 |
| Stock Number | 3129 |
| Product line | Standard Spark Plug |
| Fits | Mazda · 2 vehicles |
OE-style replacement. Standard spark plug design for service on select ignition applications.
Copper core center. Supports stable heat transfer and consistent plug performance.
Pre-gapped design. Set to 0.056 inch for straightforward installation checks.
Cross-references Anchor 3129, 0000-18-N203 and N203-18-600 for the same application. See all 4.
NGK 3129 Spark Plug Overview
The NGK 3129 spark plug is built for direct OE-style service on select Mazda RX-7 applications. It combines a copper core center electrode, nickel electrode materials, and a standard design to support consistent ignition performance.
- Fits 1984 Mazda RX-7, N/A.
- Fits 1985 Mazda RX-7, N/A.
- Part number 3129 with NGK BR9EQ-14 specification.
- 5000 ohm resistance for controlled electrical performance.
- Flat seat, 14 mm thread diameter, and 0.75 reach.
Key Features
- Standard spark plug design for OE-style replacement service.
- Copper core center electrode for stable heat transfer.
- Nickel center and ground electrode tip materials.
- Removable nut terminal for common ignition wire setups.
- Pre-gapped to 0.056 inch.
- Four ground electrodes for the specified plug design.
Detailed Description
NGK 3129 is a standard spark plug identified by BR9EQ-14 specifications and engineered to match the requirements listed for select Mazda RX-7 models. The plug uses a copper core center electrode, nickel tip materials, a flat seat, and a 14 mm thread diameter with 0.75 reach. Its 5000 ohm resistance and 0.056 inch pre-gap support consistent ignition system operation, while the removable nut terminal provides a familiar connection style for service work. This part cross-references Anchor 3129 for the same application.
Common Issues It May Address
- Hard starting caused by worn spark plug electrodes.
- Rough idle from inconsistent ignition firing.
- Misfire symptoms related to plug wear or gap drift.
- Reduced combustion efficiency from aged ignition components.
- Service replacement needs for the specified Mazda RX-7 applications.
Installation Notes and Tips
Verify the BR9EQ-14 specification, thread diameter, reach, seat type, and pre-gap before installation. Confirm the ignition wire terminal style matches the removable nut design. Use the listed fitment only for 1984 and 1985 Mazda RX-7 applications.
Quality Assurance
NGK is a major OE supplier of spark plugs in North America and has more than 80 years of automotive manufacturing experience. The brand states that it maintains original equipment standards for durability and operational performance.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 1985 | Mazda | RX-7 | 1.3L | R2 | Standard OE Spark Plug; Gap 0.055"; Actual OE Manufacturer; 30,000 mi OE Mfr Recommended Service Interval; Standard Spark Plug |
| 1984 | Mazda | RX-7 | 1.3L | R2 | Standard OE Spark Plug; Gap 0.055"; Actual OE Manufacturer; Standard Spark Plug |
| No rows match your filter. | |||||