The NGK Iridium IX Spark Plug 4218 is engineered for performance enthusiasts seeking enhanced acceleration and fuel efficiency. Designed for a wide range of ATVs and motorcycles, this spark plug features an iridium fine wire center electrode that is six times harder than platinum, ensuring durability and longevity. Its tapered cut ground electrode enhances starting, idling, and throttle response, making it an excellent choice for demanding riding conditions. With exceptional ignitability and anti-fouling properties, the NGK Iridium IX spark plug ensures consistent performance across various engine types. Upgrade your ride with this high-quality spark plug, and experience the difference in power and efficiency. For even greater performance, consider the NGK Ruthenium HX plug as an alternative option to elevate your engine's capabilities. <b>Features:</b> * Extreme ignitability for improved engine performance: Extreme ignitability for improved engine performance * Durable iridium fine wire center electrode for longevity: Durable iridium fine wire center electrode for longevity * Tapered cut ground electrode for better starting and throttle response: Tapered cut ground electrode for better starting and throttle response * High melting point iridium alloy suitable for modern engines: High melting point iridium alloy suitable for modern engines * Exceptional anti-fouling properties for consistent performance: Exceptional anti-fouling properties for consistent performance