NGK DCR8EIX Iridium IX Spark Plug – 3606
The NGK DCR8EIX is an Iridium IX spark plug designed for reliable ignition and long life. The fine iridium centre electrode needs less voltage to spark. This helps cold starts, reduces misfires, and keeps performance consistent over time.
It uses a resistor to cut electrical noise that can affect the ECU. A tapered ground electrode improves flame spread. The long-life iridium tip resists wear far better than copper or platinum.
Suitable for many modern motorcycles that use a 12 mm long-reach plug. Always confirm fitment with the vehicle lookup or check the Vehicle Fitment tab.
- Sharper spark and stable idle
- Improved throttle response and combustion efficiency
- Long service life thanks to iridium tip
| Part number | DCR8EIX |
| NGK stock number | 3606 |
| Category | 686 – Spark Plug |
| GTIN | 087295136065 |
| 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 – colder than 7) |
| Resistor | Yes |
| Centre electrode | Iridium, approx. 0.6 mm fine tip |
| Ground electrode | Nickel alloy, tapered cut |
| Preset gap | 0.8 mm (check and set to your vehicle spec) |
| Typical applications | Modern motorcycles requiring M12, long-reach iridium plugs |
Important: Always confirm thread size, reach, heat range and gap for your engine before installation. Use the vehicle lookup or see the Vehicle Fitment tab for full details.
The price displayed is for a single plug, please add the desired amount to your basket.


