Multi-rib design of insulator eliminates flashover. Harley Davidson XLH 1000 1979-1985. Spark Plugs, Iron XL. Harley Davidson XLS 1000 1979-1985. Harley Davidson XLX 1000 1983-1985. Copper core electrode prevents oxidation and corrosion and has good electrical and heat conductivity for long spark plug service life.
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