---
product_id: 558123567
title: "Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack"
brand: "autolite iridium ultra"
price: "KSh13236"
currency: KES
in_stock: false
reviews_count: 5
category: "Autolite Iridium Ultra"
url: https://www.desertcart.co.ke/products/558123567-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug
store_origin: KE
region: Kenya
---

# 8% cooler side wire temp Colder heat range for mods Nickel-plated corrosion resistance Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack

**Brand:** autolite iridium ultra
**Price:** KSh13236
**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?** KSh13236 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/558123567-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

- • **Advanced Yttrium Alloy:** Cuts side wire temperature by 8% for longer life and less pre-ignition
- • **Durable Nickel Plating:** Corrosion-resistant finish ensures consistent performance lap after lap
- • **Race-Proven Performance:** Trusted by professional drivers for peak track reliability
- • **Cut-Back Electrode Design:** Faster flame kernel growth for quicker, more efficient ignition
- • **Optimized Cold Heat Range:** Specifically engineered for high-performance, modified engines

## Overview

Autolite AR3910X Racing Spark Plugs deliver professional-grade ignition with a yttrium-enhanced alloy that reduces side wire temperature by 8%, a colder heat range tailored for modified engines, and a corrosion-resistant nickel plating. Designed for durability and faster ignition, these plugs are a top choice for racers and performance enthusiasts seeking reliable, high-performance spark plugs.

## 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: 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: These are like brisk plugs but a quarter of the cost great upgrade for plugs as long as you know your heat range.

## Features

- Replacement racing spark plug used by many professional car drivers
- Specifically designed with colder heat ranges than the factory plug to enable performance modifications and handle intense conditions
- Contains an Yttrium-enhanced alloy to enable up to 8% reduction in side wire temperature for improved durability and less pre-ignition

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00IAAVU56 |
| Assembly Required | No |
| Brand | Autolite Iridium Ultra |
| Colour | Neutral |
| Core Material | Nickel |
| Country of Origin | USA |
| Customer Reviews | 4.7 4.7 out of 5 stars (628) |
| Date First Available | 11 January 2020 |
| Generic Name | Racing Non-Resistor Spark Plug |
| Global Trade Identification Number | 00009100031105 |
| Item Dimensions LxWxH | 36 x 11 x 4 Millimeters |
| Item Weight | 54.4 g |
| Item model number | AR3910X-4PK |
| Manufacturer | FRAM |
| Manufacturer Part Number | AR3910X-4PK |
| Model | AR3910X-4PK |
| Net Quantity | 4.0 Count |
| Position | Center |
| Product Dimensions | 3.56 x 1.14 x 0.41 cm; 54.43 g |
| Thread Size | 14mm X 1.25 |
| Top Material Type | Alloy Steel |
| UPC | 009100031105 |
| 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

### ⭐⭐⭐⭐⭐ Review
*by D***E on 19 January 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!

### ⭐⭐⭐⭐⭐ Review
*by L***K on 13 December 2025*

These are like brisk plugs but a quarter of the cost great upgrade for plugs as long as you know your heat range.

### ⭐⭐⭐⭐⭐ Review
*by J***R on 21 August 2024*

Se las puse a mis dos mini bike COLEMAN una con motor 196cc y otra con 212cc... Jalan demasiado bien... Muy recomendables.

## 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

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-03-08*