NGK Iridium spark plugs have been developed to provide improved throttle response with reduced fouling for increased durability. The plugs feature a fine iridium tip which produces a better and more consistent spark for optimum engine performance. A trivalent metal plating ensures the plugs stay corrosion free and helps prevent the threads seizing.Provides a better and more consistent spark for optimised engine performanceLonger lasting than traditional copper core plugsCapable of withstanding higher temperaturesThis range of NGK Iridium spark plugs are successfully used in TKM K4S kart racing engines. The plugs are available in various heat ranges to suit different ambient temperatures.CR8EIX - Cold weather plugCR9EIX - Mild / average weather plugCR10EIX - Hot weather plug