Autolite 4164 Spark Plug. Fits Twin Cam 1999-2017, Sportster 1986up, Victory & S&S 124ci.

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Copper Core Spark Plug

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Traditional nickel electrodes. Copper core improves resistance to fouling. Power tip extends further into the combustion chamber to aid in self-cleaning, reducing fouling at low rpms and pre-ignition at high speeds.

* Replaces OEM # 31600105

* Replaces OEM # 31600106

* Replaces OEM # 32317-86

* Replaces OEM # 32362-04A