The NGK CPR6EA-9S (NGK Stock No. 1582) is a standard-series resistor spark plug featuring a nickel alloy center electrode and a solid copper core. Positioned within the iconic NGK "yellow box" line, it serves as a factory-quality Original Equipment (OE) cornerstone designed to provide highly reliable, economical performance for small-displacement engines. Technical Specifications The alphanumeric part code decodes into precise geometry and performance thresholds:

• Thread Size: 10mm (M10-1.0 thread pitch)
• Thread Reach: 19.0mm (0.75 inches / deep reach design)
• Hex Wrench Size: 16mm (5/8 inch)
• Manufacturer Heat Range: 6 (Medium heat rating optimal for standard operating temperatures)
• Factory Pre-Gap: 0.036 inches (0.9mm, denoted by the "-9")
• Terminal Type: Threaded Stud (M4 configuration)
• Internal Resistance: Yes, 5,000 Ohms (Resistor plug for electromagnetic interference suppression)
• Electrode Metallurgy: Nickel alloy tip with a 98% pure copper core for enhanced thermal dissipation
• Construction: Features trivalent metal plating for anti-seizing properties and cold-rolled threads to preserve cylinder heads.

Target Vehicle Fitment This exact plug profile is engineered for small powersports and utility machinery, acting as a critical factory component for the following line:

• Honda Off-Road Motorcycles: It is the direct factory-recommended spark plug for the Honda CRF110F dirt bike across a broad range of production years (including 2013 through 2025+ models).
• OEM Cross-Reference Interchange: Directly replaces original factory equipment part number Honda 31916-KWB-601.

Standard Installation Torque

• Aluminum Cylinder Heads: 7.2 to 8.7 lb-ft (9.8 to 11.8 Nm)
• Cast Iron Cylinder Heads: 7.2 to 10.8 lb-ft (9.8 to 14.6 Nm)