NGK 4259 Spark Plug

NGK Laser Platinum Spark Plug 4259 Overview

NGK Laser Platinum Spark Plug 4259 is an OE-style ignition component built for precise spark delivery and stable performance in select Ferrari applications. It uses a platinum center electrode, nickel ground electrode, and a 5,000 ohm resistor to support consistent ignition performance and reduced electrical noise.

Compatible with Ferrari F355, Ferrari F355 Spider, Ferrari F355 F1, Ferrari F355 GTS, and Ferrari F50 applications listed below, this NGK spark plug is specified with a .028 pre-gap, 10 mm thread diameter, .75 reach, flat seat, and 5/8 hex.

Key Features

• NGK Laser Platinum Spark Plug, part number 4259
• Platinum center electrode tip for durable spark performance
• Nickel ground electrode with standard tip and configuration
• 5,000 ohm resistor for ignition system noise suppression
• .028 pre-gap size for listed OEM applications
• 10 mm thread diameter, .75 reach, flat seat, and 5/8 hex
• Non-removable nut terminal type

Product Details

NGK’s Laser Platinum line is built around OE-focused ignition engineering, with manufacturing and distribution support from a long-established supplier to domestic and import vehicle programs. This spark plug uses a copper core center electrode with a platinum tip to support reliable combustion events, while the standard nickel ground electrode design helps maintain consistent service characteristics. Part number 4259 is also identified as PMR7A in the product data.

This part cross-references 6059 and 9495 for the same application.

What It Helps Address

• Misfire caused by worn or fouled spark plugs
• Hard starting related to weak ignition output
• Rough idle from inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Electrical interference in ignition circuits

Installation Notes

Verify the specified gap before installation and confirm the plug matches the vehicle’s OE application requirements. For fitment, use the exact vehicle listing: Fits 1999 Ferrari F355, N/A; Fits 1999 Ferrari F355 Spider, N/A; Fits 1998 Ferrari F355 F1, N/A; Fits 1994-1998 Ferrari F355 GTS, N/A; Fits 1996-1998 Ferrari F355 Spider, N/A; Fits 1996-1997 Ferrari F50, N/A; Fits 1995 Ferrari F50, N/A. Always compare thread diameter, reach, seat type, and heat range before service.

Quality Assurance

NGK is a long-established OE supplier with broad coverage across automotive, motorcycle, marine, and small engine ignition applications. Part number 4259 is manufactured to support original-equipment-level fit and performance expectations for the listed Ferrari applications.