--- product_id: 4076312 title: "(3521) CR9EIX Iridium IX Spark Plug, Pack of 1" brand: "ngk" price: "$26.14" currency: USD in_stock: true reviews_count: 13 category: "Ngk" url: https://www.desertcart.us/products/4076312-3521-cr9eix-iridium-ix-spark-plug-pack-of-1 store_origin: US region: United States of America --- # 0.6mm ultra-fine iridium tip High melting point iridium alloy Superior anti-corrosion & anti-seizing (3521) CR9EIX Iridium IX Spark Plug, Pack of 1 **Brand:** ngk **Price:** $26.14 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your ride with NGK’s cutting-edge iridium spark plug! ## Quick Answers - **What is this?** (3521) CR9EIX Iridium IX Spark Plug, Pack of 1 by ngk - **How much does it cost?** $26.14 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/4076312-3521-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 - • **Built to Last:** Durable iridium tip engineered for extended lifespan under high-stress conditions. - • **Trusted by Professionals:** NGK’s proven quality ensures dependable starts and enhanced engine response. - • **Corrosion & Seize Resistant:** Advanced anti-corrosion and anti-seizing properties keep your engine running smooth. - • **Precision Ignition Performance:** Ultra-fine 0.6mm iridium electrode for sharper, more reliable sparks. - • **Optimized for High-Tech Engines:** Iridium alloy withstands extreme temperatures, perfect for modern high-performance vehicles. ## Overview The NGK CR9EIX Iridium IX Spark Plug features a razor-thin 0.6mm iridium center electrode that delivers superior ignition precision and durability. Designed with high melting point iridium alloy, it offers exceptional resistance to corrosion and seizing, making it ideal for high-performance cars, trucks, and watercraft engines. Trusted by professionals and backed by NGK’s quality, this spark plug ensures reliable starts and optimized 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 upgrade for Yamaha Jet boats - I had purchased my first set of these last year (2015) as a spare set of plugs to keep in my Yamaha AR210 twin engine jet boat. The OEM NGK plugs are known to have short life span due to the high revving of the engines in these boats. This is the first season I have them Installed in the boat and I am certainly not dissapointed. The engines start better and perform better. I will be using these plugs going forward. Review: Great plugs work perfectly - July 20, 2015, What can I say.. if you're expecting 10 hp boost it's not gonna happen here. they do work great in my 2004 r1 just watch the top when ya put them in.. it's easy to take them out of gap when installing. Update.. 6/30/18 just changed out these plugs and air filter. I was getting a little bit of a miss and figured it was time. Plugs look great, but I do have a couple of things to note.. yes as everyone has stated the top part of the spark plug does unscrew to fit on the r1.. and there is no gapping on these spark plugs. please don't attempt it, you'll just waste your money from breaking them. ## 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 | |---------------|-------| | ASIN | B000CSGWZM | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #101,712 in Automotive ( See Top 100 in Automotive ) #619 in Automotive Replacement Spark Plugs | | Brand | NGK | | Brand Name | NGK | | Compatible with Vehicle Type | Car, Truck | | Core Material | Iridium | | Customer Reviews | 4.7 out of 5 stars 1,071 Reviews | | Global Trade Identification Number | 00087295035214, 00087295135211 | | Included Components | 3521 | | Item Weight | 0.03 kg | | Manufacturer | NGK Spark Plugs | | Manufacturer Part Number | CR9EIX | | Manufacturer Warranty Description | Includes manufacturer provided warranty | | Model Number | 3521 | | Number of Items | 1 | | Number of Packs | 1 | | OEM Equivalent Part Number | 3521 | | Top Material Type | Metal | | UPC | 087295135211 779422204029 087295035214 | | Unit Count | 1 Count | | 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 ![(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 upgrade for Yamaha Jet boats *by T***8 on July 18, 2016* I had purchased my first set of these last year (2015) as a spare set of plugs to keep in my Yamaha AR210 twin engine jet boat. The OEM NGK plugs are known to have short life span due to the high revving of the engines in these boats. This is the first season I have them Installed in the boat and I am certainly not dissapointed. The engines start better and perform better. I will be using these plugs going forward. ### ⭐⭐⭐⭐⭐ Great plugs work perfectly *by C***G on February 5, 2016* July 20, 2015, What can I say.. if you're expecting 10 hp boost it's not gonna happen here. they do work great in my 2004 r1 just watch the top when ya put them in.. it's easy to take them out of gap when installing. Update.. 6/30/18 just changed out these plugs and air filter. I was getting a little bit of a miss and figured it was time. Plugs look great, but I do have a couple of things to note.. yes as everyone has stated the top part of the spark plug does unscrew to fit on the r1.. and there is no gapping on these spark plugs. please don't attempt it, you'll just waste your money from breaking them. ### ⭐⭐⭐⭐⭐ 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. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/4076312-3521-cr9eix-iridium-ix-spark-plug-pack-of-1](https://www.desertcart.us/products/4076312-3521-cr9eix-iridium-ix-spark-plug-pack-of-1) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-19*