NGK CR8EIX Iridium Spark Plug – 4218

The NGK CR8EIX is a high-performance iridium spark plug designed to improve ignition efficiency and extend service life. It features a fine-wire 0.6mm iridium center electrode for a strong, focused spark and consistent combustion. The tapered ground electrode helps reduce quenching, and the insulator is built to withstand the heat and vibration common in modern high-revving engines.

This plug is a common upgrade over standard copper plugs for motorcycles, scooters, and lightweight sport bikes. Ideal for riders looking for better throttle response, smoother starts, and longer intervals between changes.

Specs:

• Thread Size: 10mm

• Reach: 19mm (3/4")

• Hex Size: 5/8" (16mm)

• Heat Range: 8 (NGK scale)

• Electrode Material: Iridium

• Resistor Plug: Yes

• NGK Part Number: 4218

Common Fitment:

• KTM 390 Duke / RC 390

• Yamaha MT-03 / R3

• Honda CBR500R / CB500X

• Kawasaki Ninja 250R / 300

• Suzuki SV650 (some years)

Always verify fitment with your motorcycle’s
service manual before installation.