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NGK CR8EIX Iridium IX Spark Plug (4218)
Original price was: £26.52.£14.54Current price is: £14.54.
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NGK CR8EIX Iridium IX Spark Plug (Stock No. 4218)
The NGK CR8EIX is a high-quality iridium spark plug for reliable ignition and long service life. It delivers a strong, stable spark, better cold starts, and steady performance under load. Iridium resists wear, so it keeps its gap longer than standard copper plugs.
This plug suits many modern motorcycles and powersports engines that use a 10 mm thread and 19 mm reach with a heat range of 8. Please use the vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
| Part number | CR8EIX |
| NGK stock number | 4218 |
| GTIN | 087295142189 |
| Category | 686 – Spark Plug |
| Series | Iridium IX |
| Thread diameter | 10 mm |
| Thread pitch | 1.0 mm |
| Reach (thread length) | 19.0 mm |
| Hex size | 16 mm |
| Seat type | Gasket |
| Heat range | 8 (NGK scale) |
| Resistor | Yes (approx. 5 k?) |
| Centre electrode | Fine-wire iridium, approx. 0.6 mm |
| Ground electrode | Nickel alloy, single |
| Factory gap | 0.8 mm (check/adjust to vehicle spec) |
| Terminal type | Solid |
| Washer | Sealing gasket included |
- Stronger, cleaner spark for smoother idle and throttle response.
- Improved cold starting and reduced misfires.
- Longer life than standard copper plugs thanks to the iridium tip.
Installation notes
– Check and set the gap to your vehicle specification. Avoid prying on the fine iridium tip.
– Fit by hand first to prevent cross-threading.
– Tighten to NGK torque guidance for 10 mm gasket plugs: 10-12 Nm.
– Do not use anti-seize on plated NGK threads.
– Replace all plugs in a set for consistent performance.
This plug will not create large power gains on its own. It helps your engine run reliably and maintain performance over time.
The price displayed is for a single plug, please add the desired amount to your basket.
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-4218 Confirmed Fitment
Our team haven't provided any fitment data for this product yet, please get in touch or check back later!
Stock at Progressive Parts
Delivery timescales are given as estimates in good faith, but cannot be taken as precise or exact information. We highly advise against booking installation/workshop time or engaging in preparatory work until you've received and inspected the goods.
What do our stock statuses mean?
1+ IN STOCK in green stock is readily available in one of our warehouses for express delivery (at the time of viewing).
LOW STOCK in green means we're running low! 1 or 2 left on the shelf so act fast. Over evenings, weekends and bank holidays this stock can move quickly so please bear this in mind.
0 IN STOCK in blue means our primary warehouse does not have unallocated stock, but our UK partners do. Often these can be shipped quickly and efficiently. You'll be notified via the Track My Order page if further delays are unavoidable.
MADE TO ORDER in blue means we've partnered with a supplier which primarily makes their products to order. It's not on our shelf, but your order goes into production immediately.
0 IN STOCK in orange means everybody we work with is unfortunately out of stock. Stock is not available in the UK. The best course of action is to place an order to create an allocation from the next batch arriving.
OUT OF STOCK in red. This product is unavailable to order, for whatever reason we're unable to obtain stock or there is an issue with supply/lead times.
We're tuners too!
Our staff are car enthusiasts, we understand the need for speed... This includes getting your orders out the door as quickly and securely as possible!
In some instances, extended lead times are unavoidable. This is as labour-intensive and frustrating for us as it is for you, please know we are doing our best to facilitate your modification goals. Abuse of our staff or systems will not be tolerated.
Thank you, Team PP
In the words of the Vehicle Standards Agency (VCA), type approval provides "confirmation that production and samples of a design will meet specified performance standards".
For emissions components this encompasses noise, emissions and balanced back pressure, which have a strong influence on maintaining engine performance (power), and fuel efficiency. Type approval ensures that an aftermarket component will reach, or exceed the performance standard of the corresponding OE part.
Type-approval then, is a certain guarantee that an end user will receive a product of OE equivalent performance attributes.
Products on the Progressive Parts website that meet this approval will be clearly marked or labelled EC or ECE approved.