# CR7HIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: CR7HIX**

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: 7544
-   Thread: 10 mm
-   Reach: 12.7 mm (1/2 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Threaded stud

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment. 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.

-   Aprilia QUASAR 180 (180, 2004) – Motorcycle
-   Aprilia QUASAR 125 (125, 2004) – Motorcycle
-   Baja PX250 (250) – Motorcycle
-   Baja SC150 (150) – Motorcycle
-   Baja SC125 (125) – Motorcycle
-   Baja DR90 (90) – Motorcycle
-   Baja DR70 (70) – Motorcycle
-   Baja DR50 (50) – Motorcycle
-   Baja RT50 (50) – Motorcycle
-   Baja SC50 (50) – Motorcycle
-   Baja SC50S (50) – Motorcycle
-   Baja DR49 (49) – Motorcycle
-   Beta ALP 125 (125, 2011-2008) – Motorcycle
-   Beta RR 125 4T (125, 2011-2008) – Motorcycle
-   Beta RR ENDURO 4T 125 (125, 2011-2008) – Motorcycle
-   Beta URBAN 125 (125, 2011-2008) – Motorcycle
-   Dazon ARIES 125 (125) – Motorcycle
-   Dazon SCORPION 125 (125) – Motorcycle
-   Dazon SICILIAN 125 (125) – Motorcycle
-   Dazon WILDCAT 125 (125) – Motorcycle
-   Dazon DIAMONDBACK 50 (50) – Motorcycle
-   Dazon SICILIAN 50 (50) – Motorcycle
-   Diamo FURY 150 (150) – Motorcycle
-   Diamo RETRO 150 (150) – Motorcycle
-   Diamo TRACER 150 (150) – Motorcycle

That is the 25 most common of 300 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: 4003, 4007, 5383, 7544, IUF22, U20FSZU, U22FS-ZU

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 58.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 58.00 AUD | In stock |

## Images

- CR7HIX NGK iridium spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/cr7hix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03