--- product_id: 81919183 title: "NGK Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each" brand: "ngk" price: "€ 18.91" currency: EUR in_stock: true reviews_count: 10 category: "Ngk" url: https://www.desertcart.sk/products/81919183-ngk-spark-plug-ngk-iridium-ix-14-mm-thread-0 store_origin: SK region: Slovakia --- # Iridium tip for max durability 14mm precision thread Superior anti-corrosion tech NGK Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each **Brand:** ngk **Price:** € 18.91 **Availability:** ✅ In Stock ## Summary > 🔥 Ignite your drive with NGK Iridium IX – where precision meets power! ## Quick Answers - **What is this?** NGK 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?** € 18.91 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/81919183-ngk-spark-plug-ngk-iridium-ix-14-mm-thread-0) ## 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 - • **Iridium Power Boost:** Fine iridium tip delivers unmatched durability and consistent ignition for smoother rides. - • **Plug & Play Upgrade:** Easy installation with vehicle-specific fit, transforming throttle response and engine idle instantly. - • **Corrosion & Seize Proof:** Advanced anti-corrosion and anti-seizing properties keep your spark plug reliable mile after mile. - • **Engine Longevity Champion:** High melting point alloy resists wear, extending engine life under demanding conditions. - • **Precision Fit, Peak Performance:** 14mm thread and 0.984 in reach ensure seamless compatibility with high-performance engines. ## Overview The NGK Iridium IX spark plug features a 14mm thread and 0.984-inch reach with a tapered seat, engineered for high-performance engines. Its fine iridium tip offers exceptional durability and a high melting point alloy ensures resistance to corrosion and seizing. Designed for easy installation and reliable ignition, it enhances throttle response and engine smoothness, making it a top choice for motorcycle and automotive enthusiasts seeking lasting performance. ## Description Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each Review: Great Replacement in 2009 Acadia - Have about 5,000 miles on them, so far completely uneventful. I replaced the stock platinum plugs with these after the engine started stuttering badly on steeper inclines around our house. Its apparent immediately that the car is much happier using these than what was in it to begin with. Didn't seem to increase gas mileage (I'd hoped they would) but running better is sure to be better for the life of the engine. Review: NGK Spark Plugs Rock!!! - I put these in my 2012 Chevy Camaro V6. Install was a breeze and I could definitely tell the difference in engine idle, throttle response and power when driving. I would recommend to anyone who's looking to upgrade. ## 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 | B001RLXDYQ | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #553,043 in Automotive ( See Top 100 in Automotive ) #97 in Automotive Performance Spark Plugs #2,980 in Automotive Replacement Spark Plugs | | Brand | NGK | | Brand Name | NGK | | Compatible with Vehicle Type | Motorcycle | | Core Material | Iridium | | Customer Reviews | 4.6 out of 5 stars 125 Reviews | | Global Trade Identification Number | 00087295065099, 00087295165096 | | Included Components | Per Item Description | | Item Weight | 0.05 Kilograms | | Manufacturer | Auto Extra | | Manufacturer Part Number | LTR6IX-11 | | Manufacturer Warranty Description | 30 Days | | Model Number | 6509 | | OEM Equivalent Part Number | LTR6IX-11 | | Thread Size | 14mm x 1.25mm | | Top Material Type | Metal | | UPC | 087295165096 087295065099 | | Unit Count | 1.0 Count | | Vehicle Service Type | Motorcycle | ## Product Details - **Brand:** NGK - **Core Material:** Iridium - **Thread Size:** 14mm x 1.25mm - **Top Material Type:** Metal - **Vehicle Service Type:** Motorcycle ## Images ![NGK 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) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Replacement in 2009 Acadia *by A***Y on August 14, 2015* Have about 5,000 miles on them, so far completely uneventful. I replaced the stock platinum plugs with these after the engine started stuttering badly on steeper inclines around our house. Its apparent immediately that the car is much happier using these than what was in it to begin with. Didn't seem to increase gas mileage (I'd hoped they would) but running better is sure to be better for the life of the engine. ### ⭐⭐⭐⭐⭐ NGK Spark Plugs Rock!!! *by S***S on June 20, 2015* I put these in my 2012 Chevy Camaro V6. Install was a breeze and I could definitely tell the difference in engine idle, throttle response and power when driving. I would recommend to anyone who's looking to upgrade. ### ⭐⭐⭐⭐ Great item *by A***R on August 6, 2018* Put in my Roush, all good --- ## 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.sk/products/81919183-ngk-spark-plug-ngk-iridium-ix-14-mm-thread-0](https://www.desertcart.sk/products/81919183-ngk-spark-plug-ngk-iridium-ix-14-mm-thread-0) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-07-08*