Motorcycle Spark Plugs Specification: Model NumberSpecificationGapCross ReferenceThreadReachHexNGKBOSCHCHAMPIOND8TCM12X1.253/4" (19mm)17.50.6D8EAX5CA8YCA7TCM10X11/2"(12.7mm)5/8" (16mm)0.6C7HSAU4BCZ9YCE6TCM14X1.251/2"(12.7mm)13/16" (20.6mm)0.8BP5HSW8BCL92YCF7TC3/4" (19mm)BP8ESW6DCN9YCK7TC5/8" (16mm)0.7BK7ESF7DCC9YC 1,Multi-ribs designed on the insulator can eliminate flashover 2, New 95% pure aluminum insulator provides better insulation, heat dissipation, resistance against heat shock and mechanical failure 3, Nickel-plated shell prevents oxidation and corrosion, electrical heat crimping ensure reliable sealing 4, Resistor glass not only ensures conductivity and sealing but also provides protection from radio interference 5, The center electrode has a cooper deeply inserted inside the nickel alloy tip, vastly improves heat dissipation and preventing dangerous overheating engine Welcome Your Inquiry. Contact Person: Anny Wei Tel: 0086-574-63863396 Cellphone: 0086-15824244792