# BPR7EIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: BPR7EIX**

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: 4055
-   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.

-   Volvo-Penta 145A, B – Inboard Engine
-   Volvo-Penta AQ131, A, B, C, D – Inboard Engine
-   Volvo-Penta AQ140A – Inboard Engine
-   Volvo-Penta AQ151A, B, C – Inboard Engine
-   Polaris SL 750 (750, 1995-1994) – Personal Watercraft
-   Polaris SLT 750 (750, 1995) – Personal Watercraft
-   Polaris SL 700 DELUXE (700, 1998-1996) – Personal Watercraft
-   Polaris SL 650 (650, 1995-1994) – Personal Watercraft
-   Beta CROSS TRAINER - XTRAINER (300, 2016-2015) – Motorcycle
-   Beta REV3 TRIAL (270, 2004-2000) – Motorcycle
-   Beta REV3 TRIAL (250, 2004-2000) – Motorcycle
-   Beta REV3 TRIAL (200, 2004-2000) – Motorcycle
-   Beta REV3 TRIAL (125, 2004-2000) – Motorcycle
-   Bmw R100RS (1000, 1984-1976) – Motorcycle
-   Bmw R100RT (1000, 1986-1978) – Motorcycle
-   Bmw R100S (1000, 1980-1976) – Motorcycle
-   Bmw R100T (1000, 1980-1976) – Motorcycle
-   Bmw R65 (650) – Motorcycle
-   Bmw R65LS (650) – Motorcycle
-   Bmw R60/5 (600) – Motorcycle
-   Bmw R60/6 (600) – Motorcycle
-   Bmw R60/7 (600) – Motorcycle
-   Bmw R50/5 (500) – Motorcycle
-   Bmw R45 (475, 1985-1978) – Motorcycle
-   Cobra Moto CM50 (50, 2011-2005) – Motorcycle

That is the 25 most common of 143 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: 3086, 3281, 5307, IW22, W22EP-GU, W22EP-ZU, W22EPR-ZU
-   Bosch: W4DP, W5DP, W5DPX, WR5DS
-   Autolite: AP62, XS62, XS62DP
-   ACDelco: 41-828
-   Champion: N7GY
-   Torch: F7RTP

## 📦 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

- BPR7EIX NGK iridium spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bpr7eix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03