NGK 4347 Spark Plug

NGK Laser Iridium Spark Plug for Lamborghini Murcielago

NGK Laser Iridium Spark Plug 4347 is built for precise ignition performance in select Lamborghini Murcielago applications. It combines an iridium center electrode tip with a nickel ground electrode and a 5,000 ohm resistor to support stable spark delivery and consistent combustion.

The Laser Iridium line focuses on OE-style fit and durable electrode construction. For drivers searching for a Lamborghini Murcielago spark plug replacement, NGK 4347 provides the specifications needed for the 2003 and 2004-2010 Murcielago platform.

Key Features

• Laser Iridium spark plug with iridium center electrode tip
• Nickel ground electrode with standard configuration
• 5/8 hex size, 12 mm thread diameter, .75 reach, and flat seat
• Resistor type plug with 5,000 ohm resistance
• Pre-gapped at .030 for specified applications
• NGK part number 4347, also listed as KR8BI

Detailed Description

NGK 4347 is a Laser Iridium spark plug engineered around OE-style dimensions and materials for select Lamborghini Murcielago models. The copper core, iridium tip, standard ground design, and non-removable nut terminal support reliable ignition system operation where exact plug specifications matter. This part number is referenced as KR8BI and is commonly searched as NGK 4347 spark plug for Lamborghini Murcielago.

Compatible With 2003 Lamborghini Murcielago and 2004-2010 Lamborghini Murcielago, this spark plug matches the listed fitment and notes for the application. If you are replacing worn plugs on a Lamborghini Murcielago, NGK 4347 is the direct fitment-focused option for the specified years.

This part cross-references AMS Automotive 4347 for the same application.

Common Problems This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition performance
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for specified Lamborghini Murcielago tune-up service

Installation Notes and Tips

Verify the engine specification before installation and confirm the listed gap requirement for your exact Murcielago year. The fitment notes call for a 0.031 inch gap on 2004-2010 applications and OEM recommends 0.032 inch on the 2003 application. Use the correct 5/8-inch spark plug socket and follow factory torque procedures to avoid thread or seat damage.

Because this is a flat-seat spark plug with a 12 mm thread diameter and .75 reach, matching the original application details is important for proper sealing and combustion chamber performance.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across automotive applications in North America. Its manufacturing and distribution network supports original-equipment standards for durability and operational consistency.