•  An iridium spark plug with excellent durability and firing performance has been adopted.

•  The extremely thin, center electrode has a diameter of 0.7 mm {0.03 in} (Z6), 0.5 mm {0.02 in} (ZY) and is made of iridium alloy.

•  Durability has been improved by the use of a platinum-tipped grounding electrode.

•  Based on the thinner electrode (center electrode), electric discharge has been reduced and ignition has been improved, resulting in stable ignition performance under all driving conditions.