NGK TR7IX 96090 Spark Plug Iridium IX

The NGK TR7IX 96090 is an Iridium IX spark plug designed as an upgrade from a standard plug. Its 0.6 mm fine-wire iridium centre electrode needs less voltage to fire and produces a more concentrated spark.

That spark is associated with quicker starting, crisper throttle response and steadier idle, particularly in high-compression, tuned or high-revving engines. The tapered ground electrode reduces quenching of the flame kernel. Iridium is around six times harder than platinum and wears very slowly, helping the gap stay accurate longer than with nickel. Fit it in place of the equivalent standard NGK plug of the same heat range; check the gap before installation.