# DR8EIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: DR8EIX**

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: 6681
-   Thread: 12 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 18 mm
-   Seat: Gasket
-   Terminal: Threaded stud

## 🚘 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.

-   Aprilia MOTO 6.5 (650, 1998-1995) – Motorcycle
-   Aprilia PEGASO 650 (GA) (650, 1995-1992) – Motorcycle
-   Aprilia PEGASO 650 (ML) (650, 1998-1997) – Motorcycle
-   Aprilia PEGASO 650 (MX) (650, 2004-1996) – Motorcycle
-   Aprilia PEGASO 600 (600, 1998-1990) – Motorcycle
-   Aprilia TUAREG 600 WIND (600, 1998-1988) – Motorcycle
-   Aprilia EXT 350 (349, 1998-1985) – Motorcycle
-   Aprilia TUAREG 350 (349, 1998-1987) – Motorcycle
-   Aprilia WIND (349, 1998-1987) – Motorcycle
-   Aprilia LEONARDO 250 (250, 2004-1999) – Motorcycle
-   Atk 600 DIRT TRACK AIR COOLED - 4-STROKE (600, 2003-1998) – Motorcycle
-   Atk 605 CROSS COUNTRY - 4-STROKE (600, 2000-1993) – Motorcycle
-   Atk 605 ENDURO AIR COOLED - 4-STROKE (600, 2003-1993) – Motorcycle
-   Atk SUPERMOTARD - 4-STROKE (600, 2002-2001) – Motorcycle
-   Atk 604 - 4-STROKE (560, 1992-1988) – Motorcycle
-   Atk 500 DIRT TRACK - 4-STROKE (500, 2003-1999) – Motorcycle
-   Atk 500 ENDURO - 4-STROKE (500, 2003-1998) – Motorcycle
-   Atk SUPERMOTARD - 4-STROKE (500, 2002-2001) – Motorcycle
-   Atk 350 CROSS COUNTRY - 4-STROKE (350, 1999-1991) – Motorcycle
-   Atk 350 ENDURO - 4-STROKE (350, 2002-1991) – Motorcycle
-   Atk 125 ENDURO LIQUID COOLED - 4-STROKE (125, 2003) – Motorcycle
-   Baja X250 (250) – Motorcycle
-   Baja DR125/150 (125) – Motorcycle
-   Benelli-Motobi 900 SEI (900) – Motorcycle
-   Benelli-Motobi 750 SEI (750) – Motorcycle

That is the 25 most common of 416 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: 4100, 4167, 5372, 6681, IX24, X24ES-GU, X24ES-ZU, X24ES-ZU9 and 2 more
-   Champion: A6G, A6GC, R6G
-   Autolite: XS4163, XS4163DP
-   Torch: D8RP

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 39.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 39.00 AUD | In stock |

## Images

- DR8EIX NGK iridium spark plug
- DR8EIX NGK iridium spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/dr8eix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03