Genuine NGK 6263 Spark Plug Kawasaki ZX-6R 636 B Ninja 2004     NGK CR9E Spark Plug. NGK has been developing spark plug technology since the 1930s. The vast experience and technology that NGK has, ensures that there is no doubt that NGK are the world's No.1 spark plug. FEATURES - Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties Corrugated Ribs Prevent Flashover Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer Copper Core Aids in Heat Removal Triple Seals Prevent Leakage               Check out our store for more NGK goodies! We also stock this spark plug in packs of 2, 3, 4 and 10.