# KR9CI NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: KR9CI**

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: 7795
-   Thread: 12 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: Projected

## 🚘 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.

-   Bmw K1300GT - K44 PROD. CODE 0538, 0539 (1300, 2010-2007) – Motorcycle
-   Bmw K1300R - K43 PROD. CODE 0518, 0519 (1300, 2012-2007) – Motorcycle
-   Bmw K1300S - K40 PROD. CODE 0508, 0509 (1300, 2015-2007) – Motorcycle
-   Bmw K1200GT - K44 PROD. CODE 0587, 0597 (1200, 2008-2005) – Motorcycle
-   Bmw K1200R (1200, 2008-2004) – Motorcycle
-   Bmw K1200S - K41 PROD. CODE 0581, 0591 (1200, 2008-2003) – Motorcycle

## 🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

-   Bosch: YR5DDE

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 28.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 28.00 AUD | In stock |

## Images

- KR9CI NGK racing iridium spark plug
- KR9CI NGK racing iridium spark plug firing end

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/kr9ci-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03