
NGK IRIDIUM The NGK Iridium IX spark plugs are the most technologically advanced spark plug for your high performance motorcycle. NGK uses a 0.6mm iridium center diode in these spark plugs to offer a reliable ignition. The Iridium IX spark plug is able to offer a consistently intense spark because of the durability and extremely high melting point characteristics of iridium. The intense spark from the Iridium IX spark plug improves the throttle response, acceleration and fuel efficiency.