NGK CR5HIX Spark Plug Iridium IX

The NGK CR5HIX is a discontinued spark plug that is no longer manufactured. Where a current equivalent exists it is shown in the alternatives below.NGK Iridium IX is the performance upgrade from a standard plug. The 0.6 mm fine-wire iridium centre electrode needs less voltage to fire and produces a more concentrated spark, giving quicker starting, crisper throttle response and steadier idle, particularly on high-compression, tuned or high-revving engines. Iridium is around six times harder than platinum and wears very slowly, so the gap stays accurate far longer than nickel. The tapered ground electrode reduces quenching of the flame kernel. Fitted in place of the equivalent standard NGK plug of the same heat range; check the gap before installation.