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The NGK ER9EHIX is a single-ground iridium spark plug in NGK's Iridium IX line, with a 12.7 mm hex, 19.1 mm thread reach and a heat range of 9. Its necked-down iridium center electrode is far finer than a platinum or nickel tip, which lowers the voltage the ignition system needs and can extend coil and lead life. The 5k ohm resistor and grooved ground electrode suit street and performance engines that call for a cold plug. Compared with standard nickel plugs it lasts longer and sparks more reliably; compared with NGK's Laser Iridium line it is the simpler, single-electrode option rather than a long-life OEM replacement.
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Owners of motorcycles and tuned engines generally rate the Iridium IX plugs for easy starting, smooth idle and steady running, and many report long service life. The main complaints are the higher cost than nickel plugs and occasional plugs that arrive with a gap that needs adjusting.
The NGK Iridium IX ER9EHIX is a resistor spark plug with an iridium center electrode. The iridium electrode is 25% smaller than a platinum electrode and one quarter the size of a conventional nickel electrode.
The ultra-small center electrode reduces the voltage requirement and extends ignition system life. The metal shell has new plating with improved corrosion resistance.
