NGK 4948 Spark Plug

Laser Iridium Spark Plug

NGK 4948 is a Laser Iridium spark plug built for Suzuki motocross and off-road applications that call for precise ignition performance. It combines an iridium center electrode with a nickel ground electrode and a 0.040-inch pre-gap for consistent spark delivery.

Key Features

• Laser Iridium design for stable ignition performance.
• Iridium center electrode with nickel ground electrode construction.
• 0.040-inch pre-gap and 5,000 ohm resistance.
• Flat seat, 10 mm thread diameter, and 0.75-inch reach.
• Non-removable nut terminal with standard ground configuration.

Detailed Description

NGK 4948, also identified as CR8EIB-10, is an OE-style spark plug engineered for Suzuki RMZ250, RMX450Z, and RMZ450 fitments. The tapered ground electrode tip and copper core help support efficient combustion, while the iridium center electrode is selected for durable spark performance. This part cross-references Catco 4948 for the same application.

Fits 2018-2024 Suzuki RMZ250, N/A. Fits 2018-2019 Suzuki RMX450Z, N/A. Fits 2017 Suzuki RMX450Z, N/A. Fits 2010 Suzuki RMX450Z, N/A. Fits 2013-2017 Suzuki RMZ250, N/A. Fits 2005-2007 Suzuki RMZ450, N/A.

What It Is Used For

• Restoring reliable spark output in ignition service.
• Addressing misfire concerns caused by worn plugs.
• Replacing plugs with excessive electrode wear or fouling.
• Maintaining proper combustion in high-demand Suzuki applications.

Installation Notes and Tips

Verify the specified gap before installation and confirm the heat range matches the engine application. Use the correct socket size and torque procedure for the cylinder head material. Confirm the part number 4948 and CR8EIB-10 before ordering.

Quality Assurance

NGK is a major OE supplier of spark plugs in North America and has more than 80 years of automotive manufacturing experience. Part number 4948 is produced to original equipment standards for durability and consistent operation.