Description

Genuine NGK IZFR6H11 4294 Laser Iridium Spark Plug Specifications, Features & Applications

The NGK IZFR6H11 (Part No. 4294) is a high-quality spark plug from NGK’s renowned Laser Iridium series, designed for superior ignition performance, long life, and reliability. With an iridium center electrode and a platinum-enhanced ground electrode, this plug is engineered to deliver stable combustion, improved fuel efficiency, and consistent firing — even under demanding driving conditions. It matches strict OEM standards, making it one of the most trusted choices for Honda and other Japanese vehicles.

Specifications:

• Brand: NGK

• Part Number: 4294

• Manufacturer Model: IZFR6H11

• Type: Laser Iridium

• Center Electrode Material: Iridium

• Ground Electrode Material: Nickel alloy with platinum tip

• Electrode Gap: 1.1 mm (factory pre-set)

• Thread Diameter: 14 mm

• Thread Reach: 19 mm

• Hex Size: 16 mm (5/8″)

• Heat Range: 6 (NGK scale — medium heat range)

• Resistor: Yes

• Seat Type: Gasket (washer type)

 

Key Features:

Laser-Welded Iridium Center Electrode

A fine iridium tip ensures excellent ignitability, providing a strong, clean spark that improves acceleration, cold starts, and throttle response.

Platinum-Tipped Ground Electrode

Helps maintain consistent gap over long mileage by reducing erosion — delivering stable performance throughout the spark plug’s lifespan.

Optimized for Fuel-Efficient Engines

Designed for modern, high-efficiency engines found in Honda and other Japanese manufacturers. Excellent resistance to fouling, knocking, and pre-ignition.

Long Service Life

Iridium + platinum construction enables extended service intervals, often 80,000–100,000 km depending on engine conditions and OEM guidance.

Improved Combustion & Fuel Economy

A precise spark ensures better combustion efficiency, reducing fuel consumption and engine emissions.

Smooth Engine Operation

Helps maintain smooth idling, consistent power delivery, and reduced engine vibration.

Applications — Compatible Car Engines

The NGK IZFR6H11 (4294) Laser Iridium spark plug is widely used in a variety of Honda, Acura, and select Subaru and Asian-market vehicles. It fits engines that require a 14 mm thread, 19 mm reach, 1.1 mm gap, heat range 6 iridium plug.

This spark plug is designed for reliability, smooth performance, and long life — making it a popular replacement option across many naturally aspirated and fuel-efficient engines.

Common Vehicles & Engines

Honda

The IZFR6H11 is compatible with a wide range of Honda models, especially those equipped with R-series, K-series, and older D-series engines:

• Honda Civic

  • R18A1 / R18A2 1.8L

  • D17A 1.7L (selected trims)

  • ES/FD series Civics (regional variants)

• Honda Accord

  • K24A / K24Z 2.4L (non-turbo models)

  • 2.0L engines in certain markets

• Honda CR-V

  • 2.0L (R20A)

  • 2.4L (K24A/K24Z)

• Honda HR-V / Vezel

  • 1.5L non-turbo (regional versions)

• Honda Stream

• Honda StepWGN

• Honda Airwave

• Honda Edix / FR-V

• Honda Mobilio / Mobilio Spike

• Honda Fit Aria / City (older models)

• Honda Orthia

• Honda Freed (some variants)

Acura (Honda Premium Brand)

• Acura RSX Base — K20A3

• Acura ILX 2.0L

• Acura TSX (non-turbo) 2.4L

• Acura CSX (selected trims)

Subaru

Some Subaru models sourced from Honda parts or using compatible NGK 14 × 19 mm plugs:

• Subaru models with naturally aspirated 2.0L engines in Asian markets

• Subaru G24/G20-based vehicles (regional variants)

(Not for Subaru Boxer engines — those use different thread specifications.)

Other Asian / Japanese-Market Vehicles

Used in several regional vehicles requiring:

• 14 mm thread

• 19 mm reach

• 1.1 mm gap

• Heat range 6 iridium plug

Examples include:

• Some Mazda 2.0L Asian-market models

• Some Mitsubishi 1.8–2.0L engines

• Various JDM import models with Honda-based engines