# BKR6EIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: BKR6EIX**

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: 6418
-   Thread: 14 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: ISO Projected BK-Series

## 🚘 Application

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

-   Johnson (225 HP, 2005-2004) – Outboard Engine
-   Johnson (200 HP, 2005-2004) – Outboard Engine
-   Johnson (140 HP, 2005-2003) – Outboard Engine
-   Johnson L4SRC, 5X4SRC, PL4SRC, PX4SRC (115 HP, 2004) – Outboard Engine
-   Johnson L4STS, X4STS, PL4STS, PX4STS (115 HP, 2003) – Outboard Engine
-   Johnson PL450R, PX450R (115 HP, 2005) – Outboard Engine
-   Johnson GLSOB, PX4SOR (90 HP, 2005) – Outboard Engine
-   Johnson PL4SRC, PX4SRC, PL4SRC, PX4SRC (90 HP, 2004) – Outboard Engine
-   Johnson PL4STC, PX4STC, PL4STC, PX4STC (90 HP, 2003) – Outboard Engine
-   Johnson J15EL4SDC,J15R4SDM,J15RL4SDM,J15TE4SDM,J 15TEL4SDM,J15EL4SOS,J15R4SOA,J15RL4SOA,J 15TE4SOA,J15TEL4SOA,J15WRLSOB,J15WRSOB, J15EL4SUR,J15R4SUB,J15RL4SUB,J15TE4SUB,J1 5TEL4SUB (15 HP, 2007-2005) – Outboard Engine
-   Johnson EL4SOR, R4SOA, L4SOA, TBL4SOB, TE4SOA, TEL4SOA (10 HP, 2005) – Outboard Engine
-   Suzuki DF300 (300 HP, 2011-2007) – Outboard Engine
-   Suzuki DF300AP, 30002P-210001 to 30002P-51XXXX (300 HP) – Outboard Engine
-   Suzuki DF250 (250 HP) – Outboard Engine
-   Suzuki DF250AP, 25003P-310001 to 25003P-51XXXX (250 HP) – Outboard Engine
-   Suzuki DF250SS, 25004F-310001 to 25004F-51XXXX (250 HP) – Outboard Engine
-   Suzuki DF225 (225 HP) – Outboard Engine
-   Suzuki DF200 (200 HP) – Outboard Engine
-   Suzuki DF175 (175 HP) – Outboard Engine
-   Suzuki DF150 (150 HP) – Outboard Engine
-   Suzuki DF150SS (150 HP) – Outboard Engine
-   Suzuki DF140 (140 HP, 2011-2002) – Outboard Engine
-   Suzuki DF140A, 14003F-310001 to 14003F-51XXXX (140 HP) – Outboard Engine
-   Suzuki DF115 (115 HP, 2011-2001) – Outboard Engine
-   Suzuki DF115A (115 HP) – Outboard Engine

That is the 25 most common of 275 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: 3373, 3431, 4702, 5304, 5501, IK20, IK20TT, K20PSR-B8 and 4 more
-   Champion: 9001, 9001-2, 9001S, 9201, 9201-2, 9802, 9802-2, 9802S and 1 more
-   Autolite: XP3923, XP3923DP2, XP5503, XP5503DP2, XS3923, XS3923DP, XS3924, XS3924DP
-   Bosch: 4227, 4228, F6DSR, FR6DCP, FR6DP, FR7DP, FR7DPP10
-   Torch: K6RTI, K6RTP
-   ACDelco: 9
-   Beck Arnley: 1765247

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 36.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 36.00 AUD | In stock |

## Images

- BKR6EIX NGK iridium spark plug
- BKR6EIX NGK spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bkr6eix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03