---
product_id: 4076312
title: "NGK (3521) CR9EIX Iridium IX Spark Plug, Pack of 1"
brand: "ngk"
price: "3389 kr"
currency: ISK
in_stock: true
reviews_count: 13
category: "Ngk"
url: https://www.desertcart.is/products/4076312-ngk-3521-cr9eix-iridium-ix-spark-plug-pack-of-1
store_origin: IS
region: Iceland
---

# 0.6mm ultra-fine iridium electrode Superior ignition performance Vehicle-specific perfect fit NGK (3521) CR9EIX Iridium IX Spark Plug, Pack of 1

**Brand:** ngk
**Price:** 3389 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your engine’s potential with NGK Iridium IX – where precision meets power!

## Quick Answers

- **What is this?** NGK (3521) CR9EIX Iridium IX Spark Plug, Pack of 1 by ngk
- **How much does it cost?** 3389 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/4076312-ngk-3521-cr9eix-iridium-ix-spark-plug-pack-of-1)

## 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

- • **Durability Meets Power:** Iridium core electrode offers unmatched strength and longevity over platinum plugs.
- • **Trusted by Enthusiasts:** Highly rated with 4.6 stars from over 1,000 users who demand peak performance.
- • **Engineered for Your Ride:** Vehicle-specific fit ensures seamless installation and optimal performance.
- • **Smooth & Reliable Ignition:** Delivers consistent, powerful sparks for smoother engine starts and runs.
- • **Precision Iridium Electrode:** Ultra-fine 0.6mm center electrode for maximum spark efficiency and fuel economy.

## Overview

The NGK CR9EIX Iridium IX spark plug features a 0.6mm ultra-fine iridium center electrode designed for superior ignition performance and durability. Engineered for vehicle-specific fit, it ensures smooth, reliable starts and enhanced fuel efficiency. Trusted by over 1,000 users with a 4.6-star rating, this spark plug is the ultimate upgrade for professional-grade engine performance.

## Description

NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. The iridium center electrode is both stronger and harder than platinum. This allows NGK engineers to design an ultra-fine (0.6mm)center electrode reducing the vol

Review: Perfect for Yamaha FZ09 - Received high quality NGK iridium plugs as expected. Works perfect for my Yamaha FZ09 and she runs smooth as butter. Note: just use pliers to gently unscrew the metal top. You install without them for FZ09.
Review: Great - Very good

## Features

- Fine Wire (0.6mm) Iridium Center Electrode
- NGK Part# CR9EIX
- NOTE: Does not include terminal nut, if necessary, order part #067606-0051

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000CSGWZM |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #164,095 in Automotive ( See Top 100 in Automotive ) #993 in Automotive Replacement Spark Plugs |
| Brand | NGK |
| Core Material | Iridium |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,018) |
| Date First Available | December 2, 2005 |
| Global Trade Identification Number | 00087295035214, 00087295135211 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.06 ounces |
| Item model number | 3521 |
| Manufacturer | NGK Spark Plugs |
| Manufacturer Part Number | CR9EIX |
| Model | NGK Iridium IX 3521 Spark Plug |
| OEM Part Number | 3521 |
| Position | Unknown |
| Product Dimensions | 9 x 3 x 3 inches |
| Safety Rating | Ninguno |
| Top Material Type | Metal |
| UPC | 087295135211 779422204029 087295035214 |
| Vehicle Service Type | Car, Truck |

## Product Details

- **Brand:** NGK
- **Core Material:** Iridium
- **Global Trade Identification Number:** 00087295035214, 00087295135211
- **Top Material Type:** Metal
- **Vehicle Service Type:** Car, Truck

## Images

![NGK (3521) CR9EIX Iridium IX Spark Plug, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/81T1drTUJQL.jpg)

## Questions & Answers

**Q: What gap do these usually come with from the factory?**
A: If I remember correctly it was around .028", but it is always best to double check and make sure they are correct for your application.

**Q: dos it fits yamaha r1 2009?**
A: Yup your good

**Q: Correct fitment for a  2015 Triumph Street Triple 675 ?**
A: Yes but some people like them others do not so it's up to you.

**Q: Does it fit for suzuki gsxr 1000 2017**
A: I installed it on my 1999 Hayabusa, not sure about the GSXR 1000, I assume it would work, check on youtube and search if others have used it on google search

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for Yamaha FZ09
*by I***N on July 27, 2020*

Received high quality NGK iridium plugs as expected. Works perfect for my Yamaha FZ09 and she runs smooth as butter. Note: just use pliers to gently unscrew the metal top. You install without them for FZ09.

### ⭐⭐⭐⭐⭐ Great
*by R***K on September 29, 2025*

Very good

### ⭐⭐⭐⭐⭐ found out that it's good practice to go down one heat range in plugs ...
*by R***N on July 31, 2016*

I went to these plugs for my FJR1300 after dealing with a pre-detonation I was attempting to resolve. The FJR calls for a one step hotter plug in the standard, copper plug configuration. After much research, found out that it's good practice to go down one heat range in plugs when substituting to an iridium from copper - especially when dealing with extreme hot weather conditions ( last time I rode it was 111F). Iridium plugs burn a bit hotter due to their construction (small tip design and low heat dissipation properties). In extreme heat iridium plugs can act like glow plugs, causing pre-detonation, which is what I was experiencing. After going to this one step cooler plug, performance was back to normal.

## Frequently Bought Together

- NGK Pack of 4 Motorcycle Spark Plugs No CR9EIX, Threaded Top, Per 4
- K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Honda, Kawasaki, Triumph, Yamaha Motorcycles, KN-204-1
- Motul 100948 RBF 600 RACING BRAKE FLUID 0.5L - Grey

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-01-24*