NGK D8EA Spark Plug – Stock No. 2120
The NGK D8EA is a dependable, non-resistor spark plug for many motorcycles and small engines that specify a 12 mm, gasket-seat plug with a 19 mm reach. It delivers consistent ignition, stable idle, and solid durability for street and everyday performance.
Its copper core pulls heat away from the firing tip to help prevent fouling. The nickel alloy electrodes offer long service life. Trivalent plating resists corrosion and makes removal easier.
Use this plug only where D8EA (or direct equivalents) is specified. For exact fitment, use the vehicle lookup or check the Vehicle Fitment tab.
Key benefits
- Reliable cold starts and smooth running
- Resists fouling in mixed riding and stop-start use
- Durable construction for long service intervals
| Specification | Value |
|---|---|
| Part Number | NGK D8EA |
| NGK Stock Number | 2120 |
| Category | 686 – Spark Plug |
| GTIN | 087295121207 |
| Thread Diameter | 12 mm |
| Thread Pitch | 1.25 |
| Reach (Thread Length) | 19 mm |
| Hex Size | 18 mm |
| Seat Type | Flat seat with gasket |
| Heat Range (NGK) | 8 |
| Resistor | No (non-resistor) |
| Centre Electrode | Copper core, nickel alloy |
| Ground Electrode | Standard J-type |
| Projected Tip | No |
| Factory Gap | Approx. 0.7 mm (set to OEM spec) |
| Terminal Type | Solid terminal |
| Typical Installation Torque | 14-18 Nm (12 mm gasket seat) |
Important: Always confirm heat range and gap against your vehicle’s service manual. Adjust the gap carefully and do not over-tighten.
The price displayed is for a single plug, please add the desired amount to your basket.


