The Denso Iridium Spark Plug Racing IU0124 (R0409B-8) is a high-quality spark plug specifically designed for the CRF 250 R models (years 2005-2009) and CRF 250 X (year 2007). This spark plug features a durable iridium tip that provides improved ignition performance and higher temperature resistance. It ensures efficient fuel combustion, leading to better engine performance and optimized fuel consumption. Weighing only 46 grams, it is lightweight and easy to install. The Denso Iridium Spark Plug is an ideal choice for motorcyclists who value performance and reliability. It is an essential component for the electrical system and contributes to the optimal functioning of the engine.