Spark Plugs - '75-'99 Big Twin
Plugs have a unique look with a black ceramic body and bold red logo/script, Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation, Multi-rib design of the insulator eliminates flashover, Nickel-plated housing prevents oxidation and corrosion, Multi-layer gaskets and heat crimping process ensure a leak-free, gas-tight seal, Copper core electrode prevents oxidation and corrosion, has good electrical and heat conductivity and creates long spark plug service life