NGK DR8EIX Iridium Spark Plug – Stock No. 6681
The NGK DR8EIX is a fine-wire iridium spark plug designed for clean, reliable ignition. It improves cold starts, resists fouling, and stays stable under hard use. Ideal for riders and tuners who want consistent performance and longer service life compared to standard copper plugs.
What it does and why it matters
– Iridium centre tip needs less voltage to spark, so starts are easier and misfires are reduced.
– Strong spark helps throttle response and smoother idle.
– Iridium resists wear, so gaps stay stable for longer service intervals.
Fits many motorcycles, ATVs and marine engines that use a 12 mm thread, 19 mm reach, heat range 8 plug with a gasket seat. Use our vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
| Part number | DR8EIX |
|---|---|
| NGK stock number | 6681 |
| GTIN | 087295166819 |
| Category | 686 – Spark Plug |
| 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 | 8 (NGK scale) |
| Resistor | Yes |
| Centre electrode | 0.6 mm fine-wire iridium |
| Ground electrode | Nickel alloy |
| Factory gap | 0.8 mm (check and adjust to spec if required) |
| Terminal type | Solid terminal |
- Best for riders seeking long life and steady performance with minimal maintenance.
- Suitable for engines that specify an NGK heat range 8, 12 mm x 1.25, 19 mm reach plug.
Note: Always set the gap to the engine maker’s specification and torque the plug correctly to avoid damage.
The price displayed is for a single plug, please add the desired amount to your basket.


