NGK 7421 Standard Copper Core Spark Plug

The NGK 7421 is a standard copper core spark plug trusted by automotive, motorcycle, and marine engine manufacturers worldwide. Engineered with a unique copper core and exclusive electrode design, this spark plug delivers reliable ignition, fast starts, and consistent performance across a wide range of applications.

Key Features:

• Solid copper core for superior heat dissipation and conductivity
• Triple gasket sealing process eliminates combustion gas leakage past the shell
• 99% highly pure alumina silicate insulator for excellent dielectric strength
• Corrugated ribs prevent flashover and misfires
• Cold rolled threads protect cylinder head from damage during installation
• Trivalent plating with silver chromate and zinc for maximum corrosion resistance

NGK's copper core spark plugs provide the ideal balance of performance and value, offering OEM-quality ignition components for everyday driving conditions. The precision-engineered electrode design ensures optimal spark energy transfer for complete combustion and fuel efficiency.