NGK ZKR7AI-8 Iridium Spark Plug (Stock No. 92402)
The NGK ZKR7AI-8 is a fine-wire iridium spark plug designed for clean ignition, stable idle, and consistent performance under load. The iridium centre electrode needs less voltage to spark and resists wear, so it stays sharp for longer. The built-in resistor helps cut electrical noise that can affect sensors and the radio.
Use this plug as a reliable service replacement or as a small upgrade over standard nickel plugs. It is preset with a 0.8 mm gap for precise ignition. Always confirm fitment for your engine before ordering.
- Fine-wire iridium tip for strong, consistent spark
- Resistor design to reduce electrical interference
- Preset 0.8 mm gap for accurate ignition timing
- Heat range 7 for dependable performance in demanding use
| Part Number | ZKR7AI-8 |
| NGK Stock Number | 92402 |
| GTIN | 87295924020 |
| Category | 686 – Spark Plug |
| Type | Iridium fine-wire centre electrode |
| Resistor | Yes (R) |
| Heat Range | 7 (NGK scale) |
| Factory Gap | 0.8 mm |
Note: Always check the Vehicle Fitment tab or use the site’s vehicle lookup to confirm compatibility and heat range for your specific engine. Adjusting the gap beyond factory spec is not recommended unless your ECU tune or manufacturer specifies it.
The price displayed is for a single plug, please add the desired amount to your basket.


