Champion D16 Copper Spark Plug For Harley EL / FL / WL 1936-1973

Champion Copper Plus Spark Plugs

Features:

• Built to ISO and SAE standards for proven performance
• Patented SAC-9 semi-conductor resistor for maximum EMI & RFI suppression
• Copper core center electrode allows for accurate control of heat range for longer life
• TinTac and ULTRASEAL shell for best corrosion protection of any spark plug in the industry
• Features include a wider-base insulator which provides an easier path to speed the transfer of heat
• Longer insulator nose containing a center electrode of pure copper inside of chrome-nickel to transfer heat between firings and help resist fouling
• Sold Each
• Replaces OEM D16

Fits: Knuckle Head 1936-1947, All 45" Flat Heads