NGK ZFR6U-9 Spark Plug – NGK Stock No. 90318
This NGK spark plug delivers a clean, consistent spark for reliable starting and smooth running. It uses a copper core and nickel alloy tip for stable performance and good heat control. The U-groove ground electrode helps ignite the air-fuel mix more efficiently, which can improve throttle response and fuel economy when the engine is in good condition.
Designed as a quality replacement where ZFR6U-9 is specified. It suits many petrol engines that use a 14 mm gasket-seat plug with a 19 mm reach and NGK heat range 6. Use the vehicle lookup to confirm fitment, or check the Vehicle Fitment tab.
- Resistor design to reduce electrical noise and protect sensitive electronics
- Projected tip for better cold starting and combustion efficiency
- Preset 0.9 mm gap – check and adjust if your engine requires a different gap
- Durable nickel alloy with copper core for reliable heat dissipation
- Direct replacement where NGK ZFR6U-9 is specified
Technical specifications
| Part number | ZFR6U-9 |
| NGK stock number | 90318 |
| Category | 686 – Spark Plug |
| GTIN | 87295903186 |
| Thread diameter | 14 mm |
| Thread pitch | 1.25 |
| Reach (thread length) | 19 mm |
| Hex size | 16 mm |
| Seat type | Flat seat with gasket |
| Heat range | 6 (NGK scale) |
| Resistor | Yes |
| Centre electrode | Copper core, nickel alloy |
| Ground electrode | U-groove |
| Tip projection | Projected |
| Factory gap | 0.9 mm |
| Recommended tightening torque | 18-25 Nm (14 mm gasket-seat) |
Note: Always check your owner’s manual or ECU tuning notes for the correct heat range and gap. Adjust the gap only if your engine spec requires it. Use the site’s vehicle lookup to confirm fitment.
The price displayed is for a single plug, please add the desired amount to your basket.



