NGK CR8EH9 Spark Plug (5666)

Acquire the genuine NGK CR8EH9 Spark Plug (5666), a critical ignition component engineered for precise combustion and operational reliability in compatible motorcycle engines. This OEM-specified part ensures consistent spark delivery, vital for maintaining optimal engine performance, fuel efficiency, and emissions compliance.

Technical Specifications

• Part Number: NGK 5666 (CR8EH9).
• Spark Plug Type: Standard Resistor Spark Plug, designed to suppress electromagnetic interference (EMI).
• Thread Size: 10mm; Thread Pitch: 1.0mm.
• Reach: 19mm (3/4\"), ensuring appropriate electrode positioning.
• Hex Size: 16mm (5/8\"), for standard tool compatibility.
• Heat Range: 8, indicating optimal thermal characteristics for target applications.
• Electrode Material: Durable Nickel Alloy, balancing conductivity, heat dissipation, and wear resistance.
• Resistor: Integrated, approximately 5k ohms, crucial for stable ignition timing and protecting electronics.
• Gap: Factory pre-set to 0.9mm (.035\"), verification recommended.
• Design: Solid copper core for superior heat transfer, corrugated insulator ribs preventing flashover. Triple-gasket sealing for pressure integrity.

Compatibility & Fitment

• The NGK CR8EH9 spark plug (5666) is designated for a broad spectrum of high-performance motorcycle applications. Specific models include:
• Honda CBR600F4i (2001-2006).
• Honda CBR600RR (2003-2006).
• Honda VFR800 Interceptor (1999-2009).
• Honda RVT1000R RC51 (2000-2006).
• Kawasaki ZX-6R Ninja (1998-2008).
• Suzuki GSX-R600 (1997-2000).
• Yamaha YZF-R6 (1999-2005).
• Always consult the original equipment manufacturer's service manual or cross-reference guide to confirm exact fitment for your specific motorcycle year, make, and model before purchase and installation. Incorrect selection can lead to suboptimal engine operation.

Key Performance Benefits

• Optimized Ignition Reliability: Delivers a consistent, powerful spark, minimizing misfires and promoting complete combustion even under varying engine loads. Ensures reliable engine starting and smooth idle.
• Enhanced Engine Longevity: Contributes to reduced carbon buildup, mitigating potential wear and extending engine component life by preventing unburnt fuel accumulation.
• Improved Fuel Efficiency: Efficient spark ignition maximizes energy extraction from each combustion event, leading to more efficient fuel utilization and better mileage.
• Superior Durability & Fouling Resistance: Robust nickel alloy electrodes withstand high temperatures. Heat range 8 burns off carbon deposits, resisting fouling and maintaining consistent performance.
• Corrosion and Seizing Protection: Trivalent metal plating on the shell provides anti-corrosion properties and prevents thread seizing, facilitating easier removal.
• Electrical Interference Suppression: Integrated resistor element suppresses EMI, preventing disruptions to sensitive onboard electronic systems.
• Thermal Integrity: High-alumina ceramic insulator provides dielectric strength and thermal conductivity, dissipating heat to prevent pre-ignition. Corrugated ribs enhance insulator integrity.

Authenticity Guarantee

Every NGK CR8EH9 Spark Plug (5666) provided is rigorously guaranteed as an authentic, factory-direct component. Our procurement protocols ensure all inventory is sourced exclusively from NGK's authorized distributors. This confirms adherence to NGK's OEM specifications for material composition, heat range, and construction integrity, guaranteeing performance and longevity. We diligently verify part numbers and packaging to authenticate product legitimacy.

Invest in the proven precision and reliability of NGK spark plugs; equip your motorcycle with the essential ignition component for sustained operational integrity and peak performance.