KacuYelin Iridium Spark Plugs Set of 4 — Direct-Fit OE 93501/LKAR7BIX-11S, Long-Life Ignition

KacuYelin Iridium spark plugs set of 4 delivers consistent high-voltage ignition for compatible Honda, Toyota, Mazda, Subaru and Scion engines.

This four-pack of iridium-tipped spark plugs is engineered as a direct replacement for a wide range of late-model vehicles that use OE part numbers such as 93501 and LKAR7BIX-11S. Manufactured in TS16949-certified facilities, these plugs prioritize long life, reliable spark delivery and careful fitment guidance so you can swap them in with confidence when the service interval arrives.

Will these plugs fit my car?

Compatibility spans many common models and years — but always verify before buying. Use the vehicle fitment details or a fitment tool and compare thread size, heat range and electrode design with your originals to confirm correct match.

• Fits Honda Accord (2013–2017 2.4L), Civic (2016–2020 2.0L), CR-V and Fit models listed in the fitment notes.
• Fits Toyota Corolla/Matrix (2009–2015 1.8L) and some Prius/Yaris/Lexus CT200h models noted.
• Fits many Mazda 3/6, CX-3/CX-5 and MX-5 model years included in the fitment list.
• Compatible with multiple Subaru models including Forester and Outback 2.5L/2.0L where specified.

How do iridium plugs benefit my engine compared to standard plugs?

Iridium is a harder, finer material at the electrode tip, which reduces wear and maintains a sharper spark gap over time. That can translate to steadier ignition, smoother idling and more consistent combustion across the plug's service life.

• Longer electrode life than nickel; resists erosion from repeated sparks.
• Smaller center electrode promotes a more focused and efficient spark.
• Helps preserve factory-like performance between replacements.

What should I check before installing these spark plugs?

Proper fit and installation are essential. Confirm the part fits your engine, match the new plug to the old one for thread length and tip shape, and use a torque wrench to tighten to the vehicle manufacturer’s specification.

• Verify OEM reference numbers (e.g., 93501, LKAR7BIX-11S) against your vehicle.
• Check heat range differences — keep changes within one range where possible.
• Clean spark plug well of debris before installing to prevent contamination.

How do these plugs address common ignition problems?

The KacuYelin design aims to stabilize high-voltage output and reduce symptoms caused by worn or failing plugs. While results depend on the vehicle’s overall condition, replacing worn plugs often reduces misfires and uneven idling when part of a proper tune-up.

• Targets misfire, rough idle and uneven throttle response linked to old plugs.
• Precision electrodes help maintain steady combustion across RPM range.
• Manufacturing controls and testing improve consistency across the set.

Who is this for: This set is intended for DIY mechanics and professional technicians who need OE-replacement iridium spark plugs for mid-2000s to recent-model Honda, Toyota, Mazda, Subaru, Scion and related vehicles listed in the fitment notes. Choose these plugs if you want a long-lasting iridium tip, certified manufacturing provenance and clear guidance on fitment and installation. If unsure, confirm compatibility with a fitment tool or consult a service manual before purchase.