# LKAR8AI-9 NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: LKAR8AI-9**

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: 6706
-   Thread: 12 mm
-   Reach: 26.5 mm (1.04 in)
-   Hex: 14 mm
-   Seat: Gasket
-   Terminal: Solid
-   Type: Projected Wide Gap

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment. The chart shows a 1.0 mm gap for these engines, but check it against your engine's manual before fitting.

-   Husaberg FE570/S (570, 2011-2009) – Motorcycle
-   Husaberg FS570 (570, 2011-2010) – Motorcycle
-   Husaberg FC450 (450, 2009) – Motorcycle
-   Husaberg FE450 (450, 2011-2009) – Motorcycle
-   Husaberg FX450 (450, 2011-2010) – Motorcycle
-   Husaberg FE390 (390, 2011-2010) – Motorcycle
-   Ktm 690 DUKE (690, 2011-2009) – Motorcycle
-   Ktm 690 ENDURO R (690, 2013-2009) – Motorcycle
-   Ktm 690 RFR (690, 2009) – Motorcycle
-   Ktm 690 SMC (690, 2011-2009) – Motorcycle
-   Ktm 530 EXC-R (530, 2011-2009) – Motorcycle
-   Ktm 530 XC-W (530, 2011-2009) – Motorcycle
-   Ktm 500 EXC (500, 2016-2012) – Motorcycle
-   Ktm 500 XC-W (500, 2016-2013) – Motorcycle
-   Ktm 450 EXC-R (450, 2011-2009) – Motorcycle
-   Ktm 450 SX-F (450, 2015-2014) – Motorcycle
-   Ktm 450 XC-F (450, 2015-2013) – Motorcycle
-   Ktm 450 XC-W (450, 2016-2009) – Motorcycle
-   Ktm XC-W (450, 2012-2009) – Motorcycle
-   Ktm 400 XCW (400, 2010-2009) – Motorcycle
-   Ktm 390 DUKE (390, 2016-2015) – Motorcycle

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 49.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 49.00 AUD | In stock |

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/lkar8ai-9-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03