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The NGK Iridium IX CR8EHIX-9 (part 3797) is a single resistor spark plug with a fine iridium center electrode, a 19.1 mm thread reach and a 16 mm hex. Its 0.9 mm iridium tip is far finer than a platinum or nickel electrode, which lowers the voltage needed to fire and eases load on coils and ignition systems. The heat range 8 suits many street motorcycle and small-engine applications, and the grooved single ground electrode and 5k ohm resistor are standard NGK fare. It is a direct-fit service part rather than a performance upgrade, and riders pick it for long change intervals and steady cold starts.
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The NGK Iridium IX CR8EHIX-9 is a resistor spark plug for street riding. Its iridium center electrode is 25% smaller than a platinum electrode and a 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.
