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Traditional Spark Plug, 14mm Thread Size, 21.5mm (.846") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Solid Terminal Nut, Surface Discharge, Low Angled Ground Electrode, Notched Shell Aids Cleaning, .055" (1.4mm) Gap, Heat Range 9
Surface gap plugs are nearly immune to preignition, and usually require a special high energy ignition system, they can be susceptible to fouling especially in colder applications, may be necessary in high compression applications. In addition, NGK surface gap plugs have all the features of their traditional plugs including corrugated ribs, pure alumina silicate ceramic insulator for greater strength and better heat transfer, copper core and triple interior seal. Special inductive resistor must be used with CDI ignition |
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