⚡ Ignite your drive with race-ready precision!
The Autolite AR3910X 4-pack spark plugs feature a cut-back ground electrode for improved ignitability, a precise 14mm x 1.25 thread size for vehicle-specific fit, and a durable alloy steel top with chrome exterior. Designed for high-performance racing applications, these lightweight plugs deliver reliable ignition and enhanced acceleration, manufactured by FRAM in Mexico.
| Brand | Autolite |
| Core Material | Nickel |
| Thread Size | 14mm X 1.25 |
| Top Material Type | Alloy Steel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00009100031105 |
| UPC | 009100031105 |
| Manufacturer | FRAM |
| Model | AR3910X-4PK |
| Item Weight | 1.92 ounces |
| Product Dimensions | 1.4 x 0.45 x 0.16 inches |
| Country of Origin | Mexico |
| Item model number | AR3910X-4PK |
| Is Discontinued By Manufacturer | No |
| Exterior | Chrome |
| Manufacturer Part Number | AR3910X-4PK |
M**R
Great Racing product
They were/are great in my high compression race car!
M**R
Clone racing
If you race clone motors in go karts and change the spark plug Weekly this is flat out the best deal you’re gonna find.
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.
A**.
running good
the part is good
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!
J**E
Great
Great
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.
P**S
Works Better Then Expected on My Predator 212
It was a very easy install and It started first pull with it in. I definitely also feel a slight difference in performance a little more torque and I gained 2mph in top speed. Overall an Easy 5 stars and I would recommend buying if your looking for a small and easy Performance boost for ur engine.
Trustpilot
5 days ago
2 weeks ago
