# BPR8EIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: BPR8EIX**

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: 6684
-   Thread: 14 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 20.8 mm (13/16 in)
-   Seat: Gasket
-   Type: Projected

## 🚘 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.

-   Mercruiser 390 (8 CYL GM BIG BLOCK) – Inboard Engine
-   Volvo-Penta BB140A – Inboard Engine
-   Volvo-Penta BB145C – Inboard Engine
-   Polaris PRO 1200 (1200, 2001-2000) – Personal Watercraft
-   Polaris SLX (1200, 2001-2000) – Personal Watercraft
-   Polaris SL 1050 (1050, 1998-1997) – Personal Watercraft
-   Polaris SLTX (1050, 1999-1996) – Personal Watercraft
-   Polaris SLX (1050, 1999) – Personal Watercraft
-   Polaris SL 900 (900, 1997-1996) – Personal Watercraft
-   Polaris SL 780 (780, 1997-1996) – Personal Watercraft
-   Polaris SLT 780 (780, 1997-1996) – Personal Watercraft
-   Polaris SLX 780 (780, 1997-1996) – Personal Watercraft
-   Polaris FREEDOM (700, 2004-2002) – Personal Watercraft
-   Polaris HURRICANE (700, 1997-1996) – Personal Watercraft
-   Polaris SL 700 (700, 1998-1997) – Personal Watercraft
-   Polaris SLH (700, 2001-1999) – Personal Watercraft
-   Polaris SLTH (700, 1999) – Personal Watercraft
-   Polaris VIRAGE (700, 2004-2000) – Personal Watercraft
-   Aprilia MOJITO CUSTOM 50 2T - PIAGGIA (50, 2007-2004) – Motorcycle
-   Bimota HB3 (1100) – Motorcycle
-   Cagiva 250 WMX (250) – Motorcycle
-   Cagiva 250 WRX (250) – Motorcycle
-   Cobra Moto CX50 (50, 2012) – Motorcycle
-   Cobra Moto CX50BW (50, 2012) – Motorcycle
-   Cobra Moto CX50FWE (50, 2017-2016) – Motorcycle

That is the 25 most common of 48 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.

-   Autolite: XS61, XS61DP

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 40.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 40.00 AUD | In stock |

## Images

- BPR8EIX NGK iridium spark plug
- BPR8EIX NGK iridium spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bpr8eix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03