NGK Spark Plugs For Harley Big Twin 1948-1974

NGK Spark Plugs For Harley

NGK spark plugs have a v-groove center electrode that improves ignitability and reduces quenching. The 98% pure copper core allows for greater heat dissipation, resulting in more dependable starts and a lower danger of overheating.

Features:

• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Triple seals prevent leakage
• Corrugated ribs prevent flashover
• Copper core aids in heat removal
• Thread reach 9.5 MM (3/8")
• Hex size 20.6 MM (13/16")
• Heat range 5
• Spark gap 0.8 MM / 0.031"
• Sold individually