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⚡ Ignite your engine’s full potential with Autolite Racing Spark Plugs!
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.
| ASIN | B00IAAVU56 |
| Best Sellers Rank | #23,780 in Automotive ( See Top 100 in Automotive ) #136 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 645 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 |
| Thread Size | 14mm X 1.25 |
| Top Material Type | Alloy Steel |
| UPC | 009100031105 |
| Unit Count | 4.0 Count |
| Vehicle Service Type | Car |
D**E
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!
J**E
The best 212 plug
Best plugs for mini bike motors!
S**R
Work great
They are exactly what they should be. They work great in our tillotson engines.
A**K
Better price on here!
Way better pricing for the same thing from other sites. I see gps selling them for $10/each! You get basically 2 free extra by buying this 4 pack!
M**R
Great Racing product
They were/are great in my high compression race car!
I**N
For My Minibike
A bad spark plug must've been what was causing all of the problems with my minibike cause man, this autolite racing plug WOKE IT UP!!! The engine is a month old so Im not sure if it was the existing plug or not. Regardless, these things sure seem to burn every bit of fuel in the cylinder. Extremely efficiently as well. I'd buy again for sure.
S**N
Not ideal for Jr1 go kart racing but works well in other classes
Hey look, this is a great product for Jr. 2 and up go kart racing when paired with a clone or predator. I bought this for a Jr.1 kart and I had to change the plug after every race and the kart kept dying at idle during the heat and feature races. I was told that the air from is restricted to much to run this plug in Jr.1 class so I switched to Autolite 3922 and my problems went away. This is a good product, don’t get me wrong but may not perform well with restricted plate karts. I gave them to a buddy how’s son runs the class above us and they are doing great for them.
D**N
A must have for big-builds
I only have experience with the plug's characteristics in what would be considered 212cc - 264cc open-class motors. Qualifiers would be an aftermarket ignition, .360 or greater valvetrain lift, compression, and ignition timing requiring 100 or better octane, a big valve ported head, and big jets on a big carb. These big-build configurations show a noticeable torque increase across the entire RPM range with the AR3910X plug. The power is diminished if I swap out this plug for an AR3910 or any other transistor plug. I tested a dozen or so spark plugs. I do live in coastal central Florida. So there are times these motors are burning more water than air. You may have different results if you live in a more favorable PA/DA climate.
Trustpilot
1 month ago
2 months ago