NGK - Racing Spark Plug for Honda CRF250R (R0409B-8)To withstand the severe conditions that occur in racing engines, NGK Racing Spark Plugs feature electrode materials and configurations as follows: Electrode materials Many use precious metals such as platinum or gold palladium for greater durability and lower voltage requirements. Electrode configurations Fine wire center electrodes provide better sparking and enhanced ignitability. Fine wire ground electrodes further improve the ignitability of the