Manufactured by Autolite (XS4164)
More focused ignition to prevent fouling than leading standard plug
.6mm finewire design with Sport V-trim ground electrode engineered to offer improved ignitability and durability over a standard plug
Up to 26% quicker starts than leading standard plug
More horsepower and better fuel efficiency than standard plug
Below is a cross reference list of spark plugs for use in most Harley models. While the Motor Company only recommends use of their original equipment Harley brand spark plugs, the other brands often exceed original specification and will not void your warranty. NGK and Autolite, among others, have always been a preferred performance plug for Harley motorcycles. In addition, it is often more convenient to use aftermarket spark plugs aside from the enhanced performance. All spark plugs listed meet or exceed manufacturer specifications.

NOTE: Iridium plugs should only be used with electronic ignitions, not for use with point ignitions.
 
Twin Cam 88”/96”: H-D Standard 6R12 / H-D Gold 6R12G / H-D Platinum 6R12PP / Screamin’ Eagle EX12S / ACCEL Y2418P / Autolite 4164 / Autolite Iridium XS4164 / Autolite Platinum AP4164DP2 / Bosch Platinum YR6LDE / Champion RA8HC / Denso Iridium IXU22 / NGK DCPR7E (3932) / NGK Iridium DCPR7EIX (6046) OR DCPR6EIX (8196) / Splitfire SF416D / NGK – Hotter – DCPR6E (3481) / NGK – Cooler – DCPR8E (4339) / E3 E3.36
 
XL Sportster 883 / 1200: H-D Standard 6R12 / H-D Gold 6R12G / H-D Platinum 6R12PP / Screamin’ Eagle EX12S / ACCEL Y2418P / Autolite 4164 / Autolite Iridium XS4164 / Autolite Platinum AP4164DP2 / Bosch Platinum YR6LDE / Champion RA8HC / Denso Iridium IXU22 / NGK DCPR7E (3932) / NGK Iridium DCPR7EIX (6046) / Splitfire SF416D / E3 E3.34