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?

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). ;)

Does it increase horse power

It’s more about slightly increasing compression do to plug design lowering the cc’s in the head! It’s true!

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Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack

Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack

Product ID: 558123567

Details

Brand
Autolite Ultra
Core Material
Nickel
Thread Size
14mm X 1.25
Top Material Type
Alloy Steel
Vehicle Service Type
Car

🔥8% cooler side wire temp

⚙️Colder heat range for mods

🛡️Nickel-plated corrosion resistance

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₨27848

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Description

⚡ Ignite your engine’s full potential with Autolite AR3910X!

DURABLE NICKEL PLATING - Ensures corrosion resistance and extended spark plug lifespan
YTTRIUM ENHANCED ALLOY - Reduces side wire temperature by 8% for longer life and less pre-ignition
RACE PROVEN PERFORMANCE - Trusted by professional drivers for peak track results
CUT BACKGROUND ELECTRODE - Improves ignitibility and accelerates flame kernel growth for faster combustion
OPTIMIZED COLD HEAT RANGE - Specifically engineered for modified engines to handle extreme conditions

The Autolite AR3910X 4-pack racing spark plugs feature a yttrium-enhanced alloy that lowers side wire temperature by 8%, a colder heat range tailored for performance-tuned engines, and a nickel-plated finish for superior corrosion resistance. Designed for professional-grade durability and faster ignition, these plugs are a top choice for serious racers and automotive enthusiasts seeking reliable, high-performance ignition.

Specifications

ASIN	B00IAAVU56
Brand	Autolite Iridium Ultra
Brand Name	Autolite Iridium Ultra
Compatible with Vehicle Type	Car
Core Material	Nickel
Country of Origin	USA
Customer Reviews	4.7 out of 5 stars 632 Reviews
Global Trade Identification Number	00009100031105
Item Type Name	Racing Non-Resistor Spark Plug
Item Weight	0.12 Pounds
Manufacturer	FRAM
Manufacturer Part Number	AR3910X-4PK
Model	AR3910X-4PK
Thread Size	14mm X 1.25
Top Material Type	Alloy Steel
UPC	009100031105
Unit Count	4.0 Count
Vehicle Service Type	Car
What Is In the Box	High Performance Racing Non-Resistor Spark Plug

Reviews

D**E

Perfect for karting!

19.01.2026

L**K

Awesome plugs for the price.

13.12.2025

J**R

Muy buenas

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

21.08.2024

J**E

The best 212 plug

10.06.2025

S**R

Work great

20.09.2025

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