NGK 4286 Spark Plug

Overview

NGK Laser Iridium Spark Plug 4286 is an OE-style ignition component built for specific Triumph and Suzuki applications. It uses an iridium center electrode, a nickel ground electrode, and a 0.036-inch pre-gap to support consistent spark performance in the correct applications.

Key Features

• Laser iridium center electrode for precise spark delivery.
• Copper core construction helps manage heat transfer.
• 5000 ohm resistance and stud terminal design.
• Flat seat with 10 mm thread diameter and 0.75-inch reach.
• Taper-cut ground electrode tip design with standard ground configuration.

Detailed Description

NGK part number 4286, also identified as CR8EIA-9, is a laser iridium spark plug engineered to match OE-style specifications for selected motorcycles. The plug’s 8 heat range, 5/8-inch hex, and 0.036-inch pre-gap align with the listed applications, including Suzuki DL650 V-Strom ABS, Suzuki DL650A V-Strom ABS, Suzuki DL650A V-Strom XT ABS, Suzuki DL650A V-Strom ABS Adventure, Suzuki DL650XA V-Strom XT ABS, Suzuki SFV650, and Triumph Speed Triple S. This part cross-references AMS Automotive 4286 and 09482-00556 for the same application.

Common Uses

• Restores stable ignition when the original plug is worn.
• Addresses misfire concerns caused by electrode wear or gap drift.
• Helps correct hard starting linked to degraded spark output.
• Supports smoother combustion in OE-specified motorcycle applications.

Installation Notes

Verify the application by year, make, model, and OE specification before installation. Check the plug gap against the vehicle’s service information, especially where OE notes specify 0.036 inches. Use the correct torque procedure and inspect the ignition system for related wear if performance issues persist.

Quality Assurance

NGK is a major OE spark plug supplier in North America and has more than 80 years of automotive manufacturing experience. Part number 4286 is produced to original equipment standards for durability and consistent operation.