NGK GR8DI-8 / GR9DI-8 Spark Plug - Iridium Racing

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The NGK GR8DI-8 / GR9DI-8 is a high-end racing spark plug developed for kart and high-performance motorcycle engines running at extreme RPMs and under heavy thermal load. The fine iridium center electrode ensures a strong and precise spark, minimizing the risk of misfire even at maximum speed.
With heat range 9, M14 × 1.25 mm thread, 19 mm thread length and 16 mm hex size, it delivers excellent thermal stability and durability. Thanks to NGK Iridium technology, it is the ideal choice where consistency, power and reliability are crucial under the toughest conditions.
Key Features:
Brand: NGK, world leader in racing spark plugs
Model: GR9DI-8
Heat range: 9 (iridium, racing, cold plug for highly tuned engines)
Thread: M14 × 1.25 mm
Thread length: 19 mm
Hex size: 16 mm
Gap: ~0.6 mm
Center electrode: fine-tip iridium
Type: resistor (with built-in resistance)
Seat: gasket seat
Applications: kart engines, racing motorcycles, high-performance engines under heavy thermal load
Recommended with spark plug cap code K188-H
An extreme racing spark plug, built for those who push their engines to the limit: stable ignition, maximum reliability and longer life than traditional nickel plugs.