NGK 1643 LKR7E Standard Nickel Spark Plug

The NGK 1643 (LKR7E) is a standard nickel spark plug designed for reliable OE-quality performance in automotive, marine, and powersports applications. This conventional spark plug features a proven design that delivers consistent ignition and long service life.

Key Features:

• Solid 98% pure copper core provides superior heat dissipation, conductivity, and ultra-wide heat range
• Nickel alloy center electrode offers reliable, consistent performance
• High-grade alumina silicate ceramic insulator ensures optimal dielectric performance and superior strength
• Trivalent metal plating delivers superior anti-corrosion and anti-seizing properties for easy installation and removal
• Triple gasket sealing prevents combustion gas leakage
• Corrugated ribs prevent flashover
• Projected ground electrode design for improved ignitability
• Built-in resistor (5k Ohm) suppresses electrical interference

Specifications:

• Thread diameter: 12mm
• Thread pitch: 1.25mm
• Hex size: 5/8" (16mm)
• Reach: 26.5mm (1.04")
• Seat type: Gasket
• Gap: 0.035" (0.9mm)
• Heat range: 7
• Terminal type: Solid
• Torque specs: Cast iron 10.8-18 lb-ft, Aluminum 10.8-14.5 lb-ft

Commonly used in marine outboard engines including Yamaha and various automotive applications. NGK standard spark plugs are engineered to meet OE specifications and provide dependable performance in vehicles originally equipped with nickel alloy plugs.