Autolite Spark Plugs

Autolite 4164 Spark Plug. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration. Very popular replacement plug among Harley riders for many years. For use on Twin Cam and Sportster models. Autolite® Copper Core plugs are your industry standard. Replaces HD 6R12, Harley 32317-86A Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof) Multi-rib insulator reduces danger of...

The Autolite Xtreme Sport® Spark Plug features a platinum finewire tip that helps with easy starting, reduces fouling of the spark plug, and ensures longer performance.Designed with iridium-enhanced 0.6mm finewire for improved ignitability, faster fuel combustion and a more focused ignition versus standard plugs. They also provide up to 26 percent quicker starts compared to that of standard plugs and as much as 21 percent less hydrocarbon emissions than standard plugs, which promotes better...

Autolite® 4265 Copper Core Spark Plug. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration for your Evo Big Twin or Shovelhead. Out of stock - Suggested: NGK 7634 or Champion RN12YC 5R6A Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof) Multi-rib insulator reduces danger of "flash-over" One-piece terminal post adds strength Resistor reduces radio frequency...