Manufactured by NGK (3932)
Superior construction for serious power
Versatile plugs with wide operating heat ranges prevent fouling from running too cool and preignition from running too hot
Features high alumina ceramics for improved heat dissipation and electrical insulation, deep-seated copper core for a wider heat range and a nickel alloy tip for longer life
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.
 
Twin Cam 88”/96”/103": 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