--- product_id: 68566183 title: "Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack" brand: "autolite iridium ultra" price: "€ 1.58" currency: EUR in_stock: false reviews_count: 8 url: https://www.desertcart.hr/products/68566183-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug store_origin: HR region: Croatia --- # Cut-back electrode for faster ignition 8% cooler side wire temp Nickel-plated corrosion resistance Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack **Brand:** autolite iridium ultra **Price:** € 1.58 **Availability:** ❌ Out of Stock ## Summary > ⚡ Ignite your engine’s full potential with Autolite Racing Spark Plugs! ## Quick Answers - **What is this?** Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack by autolite iridium ultra - **How much does it cost?** € 1.58 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/68566183-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug) ## Best For - autolite iridium ultra enthusiasts ## Why This Product - Trusted autolite iridium ultra brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Race-Proven Durability:** Yttrium-enhanced alloy cuts side wire temp by 8%, extending plug life under extreme conditions. - • **Lightning-Fast Ignition:** Cut-back ground electrode accelerates flame kernel growth for quicker, more reliable starts. - • **Trusted Legacy & Quality:** Backed by over 100 years and 11 billion plugs produced, Autolite delivers OE-level performance you can count on. - • **Corrosion-Resistant Finish:** Nickel plating guards against rust and wear, keeping your plugs race-ready season after season. - • **Precision Fit for Peak Performance:** Vehicle-specific design ensures optimal compatibility and maximum engine efficiency. ## Overview Autolite AR3910X Racing Spark Plugs feature a yttrium-enhanced alloy that reduces side wire temperature by 8% for improved durability and less pre-ignition. Their cut-back ground electrode design promotes faster flame kernel growth, ensuring quicker ignition. Nickel plating provides corrosion resistance, while vehicle-specific fit guarantees optimal performance. Trusted by professional racers and backed by over a century of expertise, these plugs deliver high-performance reliability for modified and stock engines alike. ## Description Autolite Racing Spark Plugs are used by many professional race car drivers. These spark plugs contain an Yttrium-Enhanced Alloy, which enables up to 8 percent reduction in side wire temperature for improved durability and less pre-ignition. Autolite racing plugs are available in colder heat ranges than most plug manufacturers to support modified engines and feature a cut background electrode for improved ignitibility and faster flame kernel growth. They are also nickel plated for a long-lasting, corrosion-resistant finish. Since its inception, the Autolite brand has provided the automotive aftermarket and Original Equipment manufacturers the highest quality ignition products. Autolite has been in operation for over 100 years and has produced more than 11 billion spark plugs and glow plugs. These plugs are specifically designed for each application to meet or exceed OE quality and performance. Autolite makes plugs for Japanese, European, and Korean cars as well as plugs for Lawn & Garden and Power Sports. As a leading supplier of spark plugs, the Autolite brand has the right ignition products for your application, regardless of make or model, import or domestic. Review: Perfect for karting! - Worked well - bought these in bulk for a kart racing weekend. I change them out twice during the weekend of hard racing because I do not want to be that parent that can't get their kid's kart started when it's go time! Review: The best 212 plug - Best plugs for mini bike motors! ## Features - Package Dimensions: 10.795 H x 2.997 L x 8.991 W (centimetres) - Package Weight: 0.181 kilograms - Country of Origin : Mexico - Features cut back ground electrode for improved ignitability of flame kernel - Fit type: Vehicle Specific ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00IAAVU56 | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #225,092 in Automotive ( See Top 100 in Automotive ) #1,443 in Automotive Replacement Spark Plugs | | Brand | Autolite Iridium Ultra | | Brand Name | Autolite Iridium Ultra | | Compatible with Vehicle Type | Car | | Core Material | Nickel | | Customer Reviews | 4.7 out of 5 stars 647 Reviews | | Global Trade Identification Number | 00009100031105 | | Included Components | High Performance Racing Non-Resistor Spark Plug | | Item Type Name | Racing Non-Resistor Spark Plug | | Item Weight | 1.92 ounces | | Manufacturer | FRAM | | Manufacturer Part Number | AR3910X-4PK | | Manufacturer Warranty Description | Lifetime Limited Warranty | | Model Number | AR3910X-4PK | | Thread Size | 14mm X 1.25 | | Top Material Type | Alloy Steel | | UPC | 009100031105 | | Unit Count | 4.0 Count | | Vehicle Service Type | Car | ## Product Details - **Brand:** Autolite Iridium Ultra - **Core Material:** Nickel - **Thread Size:** 14mm X 1.25 - **Top Material Type:** Alloy Steel - **Vehicle Service Type:** Car ## Images ![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 1](https://m.media-amazon.com/images/I/71Bq-jTkqeL.jpg) ![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 2](https://m.media-amazon.com/images/I/81Qh3Rx2YFL.jpg) ![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 3](https://m.media-amazon.com/images/I/81qS1Ks6FcL.jpg) ![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 4](https://m.media-amazon.com/images/I/71Jo61loCbL.jpg) ![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 5](https://m.media-amazon.com/images/I/81C0GaELbSL.jpg) ## Questions & Answers **Q: This spark plug makes my Predator - 212cc engine run very hot compared to a standard spark plug, is it normal to gain 30+ temps using this plug?** A: It can increase the heat of the engine if you only have stock parts, and could overheat it. I have a bigger fuel jet to let more fuel in, odd as it may seem, more gas cools the engine. These plugs burn basically all the gas that goes in, thus it will get hotter. I would recommend a larger fuel jet, mine hasn't overheated since I got one...Gives a noticeable amount more power as well (Gave my 500 pound go kart 10mph more speed). ;) **Q: What size plug wrench does this plug take?** A: 11/16 **Q: How much longer are these compared to NGK race plugs extened tip ?** A: Same **Q: Does it increase horse power** A: It’s more about slightly increasing compression do to plug design lowering the cc’s in the head! It’s true! ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect for karting! *by D***E on January 19, 2026* Worked well - bought these in bulk for a kart racing weekend. I change them out twice during the weekend of hard racing because I do not want to be that parent that can't get their kid's kart started when it's go time! ### ⭐⭐⭐⭐⭐ The best 212 plug *by J***E on June 10, 2025* Best plugs for mini bike motors! ### ⭐⭐⭐⭐⭐ Work great *by S***R on September 20, 2025* They are exactly what they should be. They work great in our tillotson engines. ## Frequently Bought Together - Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Autolite AR3933X-4PK High Performance Racing Non-Resistor Spark Plug, 4 Pack --- ## 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.hr/products/68566183-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug](https://www.desertcart.hr/products/68566183-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-22*