NGK CR8EIX Iridium Spark Plug – 4218 The NGK CR8EIX is a high-performance iridium spark plug designed to improve ignition efficiency and extend service life. It features a fine-wire 0.6mm iridium center electrode for a strong, focused spark and consistent combustion. The tapered ground electrode helps reduce quenching, and the insulator is built to withstand the heat and vibration common in modern high-revving engines. This plug is a common upgrade over standard copper plugs for motorcycles, scooters, and lightweight sport bikes. Ideal for riders looking for better throttle response, smoother starts, and longer intervals between changes. Specs: Thread Size: 10mm Reach: 19mm (3/4") Hex Size: 5/8" (16mm) Heat Range: 8 (NGK scale) Electrode Material: Iridium Resistor Plug: Yes NGK Part Number: 4218 Common Fitment: KTM 390 Duke / RC 390 Yamaha MT-03 / R3 Honda CBR500R / CB500X Kawasaki Ninja 250R / 300 Suzuki SV650 (some years) Always verify fitment with your motorcycle’s service manual before installation. Part Number: 4218
