NGK 3992 Spark Plug

Racing Spark Plug for Performance Use

NGK 3992 is a racing spark plug built around a copper core center electrode, nickel tip materials, and a standard ground design. It uses a 0.024-inch pre-gap and a flat seat, making it a direct service choice for high-output two-stroke applications that call for this specification.

Key Features

• Copper core center electrode for stable ignition performance.
• Nickel center and ground electrode tip materials.
• 0.024-inch pre-gap specified in the fitment data.
• Flat seat with 14 mm thread diameter and 0.75-inch reach.
• 5 kOhm resistance and a non-removable nut terminal.
• NGK BR8EG SOLID / 3992 spark plug specification.

Detailed Description

This NGK spark plug is identified by part number 3992 and stock number 3992, with the BR8EG SOLID designation. It is configured for racing and performance-oriented two-stroke engines that require a flat-seat plug with a 14 mm thread, 13/16 hex, and 0.024-inch gap. Compatible applications include KTM 200 XC-W, KTM 200 EXC, Kawasaki KX500, Suzuki RM250, and Yamaha YZ250, along with other listed fitments. For buyers searching for an NGK 3992 spark plug for KTM 200 XC-W or a replacement spark plug for Yamaha YZ250, this part matches the published specification set.

Common Uses

• Replacing a worn or fouled racing spark plug.
• Restoring consistent ignition in a high-compression two-stroke engine.
• Addressing misfire, hard starting, or weak spark caused by plug wear.
• Matching OEM-specified gap and heat range requirements.

Installation Notes and Tips

Verify the required gap before installation and confirm the engine calls for a flat-seat plug with 14 mm threads and 0.75-inch reach. Use the published heat range and gap specification for the application, and compare the existing plug’s terminal style and hex size before service. Fitment includes KTM, Kawasaki, Suzuki, Yamaha, and Gas Gas applications listed in the vehicle data.