NGK ILKAR7J7G Laser Iridium Spark Plug – Stock No. 91121
This NGK Laser Iridium spark plug delivers a strong, reliable spark for efficient combustion. It helps cold starts, smooth idle, and consistent performance under load. Iridium and platinum precious metals give long service life and stable performance over time.
Use it as a direct replacement where specified. Ideal for standard or lightly tuned petrol engines. Always confirm fitment for your exact engine on our Vehicle Fitment tab or with the site’s vehicle lookup.
- Fine-wire iridium centre electrode for dependable ignition and throttle response
- Platinum ground pad for long life and stable gap
- Resistor design reduces electrical noise that can affect sensors and the ECU
| Part Number | ILKAR7J7G |
| NGK Stock Number | 91121 |
| Category | 686 – Spark Plug |
| GTIN | 87295911211 |
| Plug Type | Laser Iridium |
| Heat Range | 7 (NGK scale) |
| Thread Diameter | 12 mm |
| Thread Pitch | 1.25 |
| Reach | 26.5 mm |
| Hex Size | 14 mm |
| Seat Type | Flat seat with gasket |
| Resistor | Yes |
| Centre Electrode | Iridium fine wire |
| Ground Electrode | Nickel with platinum pad |
| Factory Gap | 0.8 mm |
Important: Always match the heat range and design to your exact engine. Install to the correct torque on a cold engine and use new gaskets. Do not adjust the factory-set gap unless the vehicle manufacturer specifies it.
The price displayed is for a single plug, please add the desired amount to your basket.


