--- product_id: 30955245 title: "NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--" brand: "ngk" price: "£37.25" currency: GBP in_stock: true reviews_count: 13 category: "Ngk" url: https://www.desertcart.co.uk/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack store_origin: GB region: United Kingdom --- # Iridium core for superior ignition OEM perfect fit, no modifications needed Longer lifespan, fewer replacements NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- **Brand:** ngk **Price:** £37.25 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your ride with precision and power — never miss a beat! ## Quick Answers - **What is this?** NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- by ngk - **How much does it cost?** £37.25 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack) ## 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 - • **Trusted by Pros:** Top choice for 2024 Yamaha VX Limited TR-1 engine users seeking reliability - • **Precision OEM Fit:** Seamlessly replaces NGK CR9EB plugs for hassle-free installation - • **Iridium Power Core:** Delivers reliable, consistent spark for quick startups every time - • **Extended Durability:** Engineered to last longer, reducing maintenance frequency - • **Optimized for Longevity:** Designed to withstand high-performance conditions without degradation ## Overview The NGK CR9EIX Iridium IX Spark Plug 4-Pack is a genuine OEM replacement part (#3521) designed for cars, trucks, and watercraft engines like the 2024 Yamaha VX Limited TR-1. Featuring a durable iridium core and exact OEM fit, it ensures quicker startups and longer service intervals without boosting horsepower. Highly rated for reliability and longevity, it’s the smart upgrade for professionals who demand consistent engine performance and reduced maintenance downtime. ## Description NGK OEM part# 3521 Review: 2024 Yamaha VX Limited Tr1 Engine - We use these plugs in our 2024 Yamaha VX limited waverunner with the TR-1 engine. They do NOT improve horsepower or top speed, so if your purchasing for one of those, that is a fools errand. What these plugs DO in fact benefit you is longevity and quicker firing at startups. Some folks are saying they notice quicker throttle response and all and that's just psychological foolery lol. These are an excellent replacement for the oem NKG CR9EB plugs if your looking for less changing intervals and improved startups. Review: GOOD PRODUCT - VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE ## Features - Genuine, OEM Ngk Replacement Part - Ngk replacement spark plug, part number 3521 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004SKYAWM | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #7,112 in Automotive ( See Top 100 in Automotive ) #28 in Automotive Replacement Spark Plugs | | Brand | NGK | | Brand Name | NGK | | Compatible with Vehicle Type | Car, Truck | | Core Material | Iridium | | Customer Reviews | 4.8 out of 5 stars 545 Reviews | | Included Components | 3521 | | Item Weight | 5.28 ounces | | Manufacturer | NGK | | Manufacturer Part Number | CR9EIX | | Manufacturer Warranty Description | Includes manufacturer provided warranty | | Model Number | 3521 | | Number of Items | 1 | | OEM Equivalent Part Number | 7085731 | | Thread Size | 10mm | | Top Material Type | Iridium | | Unit Count | 1.0 Count | | Vehicle Service Type | Car, Truck | ## Product Details - **Brand:** NGK - **Core Material:** Iridium - **Thread Size:** 10mm - **Top Material Type:** Iridium - **Vehicle Service Type:** Car, Truck ## Images ![NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- - Image 1](https://m.media-amazon.com/images/I/61wBxBvQUhL.jpg) ## Questions & Answers **Q: Are these ngk 3521 cr9eix iridium ix spark plugs?** A: These are correct and they perform flawlessly! Ron **Q: Will these fit a 2019 polaris rzr turbo s** A: To be safe: check with dealer or a cross reference app to be sure. Ron **Q: Will this work on my Harley Davidson 2018 street glide special?** A: I have a 2017 Road King with the Milwaukee 8 and this is the one it calls for. **Q: Are these the right iridium plugs for an Indian scout 60?** A: NGK has multiple grades of plugs that may fit your engine. It is recommended to go to NGK site at https://ngksparkplugs.com/en/part-finder to verify the applications that will fit your engine. This site will show you all of the available plugs to fit your engine and will also show you which grade plug is recommended for the best performance of your specific engine. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 2024 Yamaha VX Limited Tr1 Engine *by T***N on May 19, 2026* We use these plugs in our 2024 Yamaha VX limited waverunner with the TR-1 engine. They do NOT improve horsepower or top speed, so if your purchasing for one of those, that is a fools errand. What these plugs DO in fact benefit you is longevity and quicker firing at startups. Some folks are saying they notice quicker throttle response and all and that's just psychological foolery lol. These are an excellent replacement for the oem NKG CR9EB plugs if your looking for less changing intervals and improved startups. ### ⭐⭐⭐⭐⭐ GOOD PRODUCT *by M***. on February 20, 2026* VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE ### ⭐⭐⭐⭐⭐ Good *by D***. on December 2, 2025* Great price for these quality spark plugs. My bike is running better! ## Frequently Bought Together - NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- - K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Suzuki Motorcycles, KN-138 - K&N Engine Air Filter: High Performance, Premium, Powersport Air Filter: Fits 2006-2010 SUZUKI (GSXR600, GSXR750) SU-7506 --- ## 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.co.uk/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack](https://www.desertcart.co.uk/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-30*