NGK spark plug CR9EIA-9 Laser Iridium
The NGK CR9EIA-9 Laser Iridium spark plug is a fine-wire iridium resistor plug designed for high-performance motorcycle engines that specify a 10 mm, 19 mm reach, gasket-seat plug with a 0.9 mm gap. It matches many late-model Kawasaki, Suzuki, Triumph, Husqvarna and Yamaha powersports applications that call for NGK 6289 CR9EIA-9.
Technical specifications
- Thread diameter: 10 mm
- Thread pitch: 1.0 mm
- Seat type: Gasket
- Reach: 19 mm (3/4″)
- Hex size: 5/8″ (16 mm)
- Terminal type: Threaded stud
- Spark plug gap: 0.035″ (0.9 mm)
- Center electrode: 0.6 mm fine-wire iridium, non-projected
- Ground electrode: Platinum, standard taper cut, single electrode
- Resistor: Yes, 5 kΩ
- Heat range: 9 (NGK scale)
- Construction features: Copper core, pure alumina silicate ceramic insulator, trivalent metal plating, corrugated ribs, triple-sealed
- Recommended service life: Up to 100,000 miles
- Torque (cast iron head): 7.2–10.8 lb·ft
- Torque (aluminum head): 7.2–8.7 lb·ft
Service context
Use the NGK CR9EIA-9 Laser Iridium spark plug when replacing worn plugs that cause hard starting, misfire under load, or poor throttle response. The iridium center and platinum ground electrodes provide stable spark and long service intervals in modern high-output engines.
Installation note
This spark plug installs as a direct replacement for the specified NGK CR9EIA-9 / 6289 applications; verify heat range and thread/reach against the engine specification and tighten to the listed torque values.
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