NGK offers you an Iridium IX spark plug designed with a fine iridium center electrode and an optimized ground electrode to produce a more precise and concentrated spark, promoting more complete combustion of the air/fuel mixture, improving engine response, idle stability and overall performance, while reducing fouling and misfiring, with a robust design able to withstand the high temperatures and extreme stresses of motocross, guaranteeing enhanced reliability and superior longevity even under heavy use.