---
product_id: 81919183
title: "Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each"
brand: "ngk"
price: "A$30"
currency: AUD
in_stock: true
url: https://www.desertcart.com.au/products/81919183-spark-plug-ngk-iridium-ix-14-mm-thread-0-984
store_origin: AU
region: Australia
---

# Iridium tip for max durability 14mm x 1.25mm precision thread Superior anti-corrosion & anti-seize Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each

**Brand:** ngk
**Price:** A$30
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your ride with NGK’s iridium edge!

## Quick Answers

- **What is this?** Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each by ngk
- **How much does it cost?** A$30 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/81919183-spark-plug-ngk-iridium-ix-14-mm-thread-0-984)

## Best For

- ngk enthusiasts

## Why This Product

- Trusted ngk brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Fit:** 14mm x 1.25mm thread size ensures seamless installation and optimal performance for your motorcycle.
- • **Unmatched Longevity:** Fine iridium tip engineered to outlast standard plugs, keeping your engine firing flawlessly.
- • **High-Performance Ready:** Iridium alloy’s ultra-high melting point is built for today’s demanding, high-tech engines.
- • **Corrosion-Resistant Armor:** Advanced anti-corrosion and anti-seizing properties protect your spark plug from wear and tear.
- • **Trusted Brand Reliability:** NGK’s proven quality means you’re investing in a spark plug that professionals rely on.

## Overview

The NGK LTR6IX-11 Iridium IX Spark Plug features a fine iridium tip for exceptional durability, a precise 14mm x 1.25mm thread for perfect fitment, and superior anti-corrosion and anti-seizing properties. Designed for high-performance motorcycle engines, it delivers reliable ignition and long-lasting performance trusted by professionals.

## Description

Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each

## Features

- You can depend on NGK for quality and reliability
- Constructed from durable material
- Fine Iridium tip ensures high durability
- Features superior anti-corrosion and anti-seizing properties
- Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | NGK |
| Core Material | Iridium |
| Thread Size | 14mm x 1.25mm |
| Top Material Type | Metal |
| Vehicle Service Type | Motorcycle |
| Global Trade Identification Number | 00087295165096, 00087295065099 |
| UPC | 087295165096 087295065099 |
| OEM Part Number | LTR6IX-11 |
| Manufacturer | Auto Extra |
| Model | NGK6509 |
| Item Weight | 1.58 ounces |
| Product Dimensions | 37.4 x 9.84 x 8.27 inches |
| Item model number | LTR6IX-11 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | LTR6IX-11 |

## Product Details

- **Brand:** NGK
- **Core Material:** Iridium
- **Thread Size:** 14mm x 1.25mm
- **Top Material Type:** Metal
- **Vehicle Service Type:** Motorcycle

## Images

![Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each - Image 1](https://m.media-amazon.com/images/I/61DjMfbmYQL.jpg)

## Questions & Answers

**Q: Has anyone had these for a while and did you have any problems since installing them? I have a GM 3.6 with COP and want to replace stock plugs.**
A: I've had these for 2 years and I havnt had any problems after installing. Noticed a difference in performance and fuel economy

**Q: how do they work on a mustang 2012 v6 ?**
A: Thank you for inquiry. Yes, this will work on 2012 Ford Mustang V6. Don't hesitate to contact us if we may further assist you.

**Q: What size socket wrench does this fit? When measured, it fell between 9/16" and 10/16"**
A: There is no such thing as a 10/16" socket. I0/16" is 5/8". I use a 5/8" spark plug socket which has a rubber insert so the plug stays in the socket when taking out and installing.  Saves a lot of trouble. Socket wrench is what you install the socket or extensions on which you will need.

**Q: Suggested torque for these in an aluminum cylinder head?**
A: According to NGK, it depends on the plug's diameter:
 18 mm	35 to 40N·m (3.5 to 4.0 kgm)
14 mm	25 to 30N·m (2.5 to 3.0 kgm)
12 mm	15 to 20N·m (1.5 to 2.0 kgm)
10 mm	10 to 12N·m (1.0 to 1.2 kgm)
8 mm	8 to 10N·m (0.8 to 1.0 kgm)

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**Shop now:** [https://www.desertcart.com.au/products/81919183-spark-plug-ngk-iridium-ix-14-mm-thread-0-984](https://www.desertcart.com.au/products/81919183-spark-plug-ngk-iridium-ix-14-mm-thread-0-984)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-05*