KTM DUKE 390 / R ( GEN 2 / GEN 3 ) | High performance | Spark plug cable kit | Resistor Spark CapsKTM DUKE 390 R ( GEN 2 GEN 3 ) High performance Spark plug cable kit Resistor Spark Caps NGK Iridium IX spark plugs are globally the best performance category of spark plugs having a superior technology. These spark plugs use very precious Iridium metal at the tip of centre electrode of diameter 0. 8mm and have a thermo edge design for central electrode. These features give anti carbon fouling performance, smoothest running, and excellent acceleration