NGK 4259 Spark Plug

NGK Laser Platinum Spark Plug Overview

The NGK Laser Platinum Spark Plug 4259 is engineered for precision ignition performance in select Ferrari models. Designed with advanced materials and specifications, this spark plug supports reliable combustion and efficient engine operation for vehicles like the Ferrari F50 and F355 series.

• Part Number: 4259 (PMR7A)
• Compatible with Ferrari F50, F355, F355 F1, F355 GTS, and F355 Spider
• Center Electrode Tip Material: Platinum for enhanced durability
• Center Electrode Core Material: Copper for optimal conductivity
• Ground Electrode Core Material: Nickel with standard tip design
• Resistance: 5000 ohms to reduce electrical noise
• Pre-Gap Size: 0.028 inches for precise spark delivery
• Thread Diameter: 10.00 mm with 0.75 inch reach
• Hex Size: 5/8 inch for standard installation tools
• Flat Seat Type and Insulator Height of 50.00 mm
• Manufacturer Heat Range: 7, suitable for high-performance engines
• Electrical Terminal Type: Non-removable nut

About the NGK Laser Platinum Spark Plug Line

The Laser Platinum Spark Plug line from NGK combines platinum-tipped electrodes with copper cores to balance durability and conductivity. This design helps maintain consistent ignition performance over extended service intervals. The 4259 model benefits from this technology, providing stable combustion and resistance to electrode wear, which is critical for high-performance Ferrari engines.

Technical Details and Performance

The NGK 4259 spark plug features a platinum center electrode tip that enhances electrode longevity and maintains a stable spark. The copper core center electrode ensures efficient electrical conductivity, while the nickel ground electrode provides durability under high-temperature conditions. With a resistance rating of 5000 ohms, this spark plug minimizes electromagnetic interference, protecting sensitive vehicle electronics. The pre-gap size of 0.028 inches is factory set to optimize ignition timing and combustion efficiency in Ferrari F50 and F355 models.

Applications and Problem Solving

• Restores consistent ignition in Ferrari F50 and F355 engines
• Reduces misfires caused by electrode wear or corrosion
• Improves fuel efficiency through stable spark delivery
• Minimizes electrical noise affecting onboard electronics
• Supports high-performance engine operation under demanding conditions

Installation Notes and Tips

When installing the NGK Laser Platinum Spark Plug 4259, ensure the spark plug gap is checked and adjusted if necessary, although it comes pre-gapped at 0.028 inches. Use a torque wrench to tighten the spark plug to the manufacturer’s specifications to avoid damage to the flat seat and ensure proper sealing. The 5/8 inch hex size fits standard spark plug sockets, and the non-removable nut terminal type requires compatible ignition wire connectors. Always inspect the cylinder head threads before installation to prevent cross-threading.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Platinum Spark Plug 4259 undergoes rigorous testing for heat range, electrode wear, and electrical resistance. While specific warranty details may vary, NGK typically offers coverage against manufacturing defects. Refer to NGK’s official documentation for warranty terms applicable to this part.