# CR8EIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: CR8EIX**

Iridium NGK spark plugs offer a longer service life than a standard nickel-tipped spark plug: while nickel-alloy plugs offer a service life of roughly 20,000-40,000km, NGK Iridium IX spark plugs offer a service life of up to 60,000km, so fewer replacements are needed over time despite the higher initial cost.

Precious-metal spark plugs like the NGK Iridium IX also offer higher ignitability, achieved with an exposed fine-tip centre electrode that promotes superior flame growth compared with a standard spark plug. Iridium has a much higher melting point (2410°C) than nickel (1453°C), allowing the centre electrode diameter to be reduced from 2.5mm to 0.6mm – a smaller electrode mass that reduces the impedance to flame progress, helping acceleration, fuel consumption and idle quality.

## ⚙️ Key Features

-   Fine iridium-tipped centre electrode for a slow wear rate and stable idle
-   Longer service life than standard nickel plugs
-   Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
-   Corrugated ribs reduce the risk of flashover
-   Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
-   Copper core aids in heat removal
-   Triple seals prevent leakage

## 📏 Specifications

-   NGK stock number: 4218
-   Thread: 10 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and automotive vehicles. The gap is not the same on all of them – the chart lists between 0.5 mm and 1.0 mm depending on the engine, so check the line for yours.

-   Bombardier (Sea-Doo) SPARK (900, 2016) – Personal Watercraft
-   Bombardier (Sea-Doo) SPARK ACE 900 (2UP) (900, 2015-2014) – Personal Watercraft
-   Bombardier (Sea-Doo) SPARK ACE 900 HO (2UP & 3UP) (900, 2015-2014) – Personal Watercraft
-   Aprilia SCARABEO 250 (250, 2001) – Motorcycle
-   Aprilia SCARABEO 250 (250, 1999) – Motorcycle
-   Aprilia SCARABEO 200 - ROTAX (200, 2004-1999) – Motorcycle
-   Aprilia LEONARDO 150 (150, 2004-1996) – Motorcycle
-   Aprilia SCARABEO 150 (150, 2004-1999) – Motorcycle
-   Aprilia LEONARDO 125 (125, 2004-1996) – Motorcycle
-   Aprilia SCARABEO 125 - ROTAX (125, 2004-1999) – Motorcycle
-   Beta RR 125 MOTARD 4T LC (125, 2011-2010) – Motorcycle
-   Beta RR ENDURO 4T 125 LC (125, 2011-2010) – Motorcycle
-   Ccm 4 VALVE - 4-STROKE (1981-79) – Motorcycle
-   Gas Gas FSE450 (450, 2005-2004) – Motorcycle
-   Gas Gas SM450 (450, 2004) – Motorcycle
-   Gas Gas EC300 (300, 2004-2002) – Motorcycle
-   Honda FRJ1300 (1300, 2003) – Motorcycle
-   Husaberg FC600 (600, 1996-1992) – Motorcycle
-   Husaberg FC600 (600, 2000-1999) – Motorcycle
-   Husaberg FE600 (600, 1998-1992) – Motorcycle
-   Husaberg FE600 (600, 2000) – Motorcycle
-   Husaberg FE600E (600, 2000-1999) – Motorcycle
-   Husaberg FES600E (600, 1998) – Motorcycle
-   Husaberg FS600 (600, 1999) – Motorcycle
-   Husaberg FX600E (600, 2000-1997) – Motorcycle

That is the 25 most common of 188 applications NGK's charts list for this plug – ask us to check yours.

## 🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

-   DENSO: 4189, 4218, 5362, 5365, IU24, IU24A, U24ESR-NZU
-   Autolite: XS4302, XS4302DP

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 42.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 42.00 AUD | In stock |

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/cr8eix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03