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 sparkplugs listed meet or exceed manufacturer specifications. Spark PlugBrandTwin Cam88″ / 96″V-RodEVO 1340 80″XL Sportster883/1200XL Sportster1100XR 1000H-D Standard6R1210R12A5R6A6R124R56R7H-D Gold6R12G10R12AG5R6AG6R12G4R5GH-D Platinum6R12PP10R12APP5R6APP6R12PPXL10SScreamin’ EagleEX12SEVS13SEX12S2402ACCELY2418P2410AY2418PAC Delco121XLSR44NS42F/42-6FSAutolite4133996Autolite IridiuimAutolite PlatinumAP4164DP2AP4265DP2AP4164DP2Bosch / PlatinumYR6LDEX4CSWR8DPYR6LDEW5ACWR8DPChampionRAX94YCRN12YCRL82YCRN7YCDenso IridiumIXU22IXU24IW16IXU22IWF22IW22DCPR8EB7EBNGK PlatinumBPR5EVX11SplitfireSF416DSF416BSF6DSF416DSF21FSF6B.
Harley Spark PlugCross-ReferenceXL Sportster1000XL Sportster900Shovelhead1975-1981Shovelhead1982-1984Panhead/Shovel1947-1974H-D Standard4R54R55R6A5RL4R or 4R5H-D Gold4R5G4R5G5R6AG5R6AG4R5GH-D PlatinumXL10SXL10S5R6APP5R6APP–Screamin’ Eagle2413EVS13SSH13SSH12SACCEL––2410A2417–AC Delco42F/42-6FS42F/42-6FS44NS/44XLS44NS/44XLS–Autolite41232585–Autolite Platinum––AP4265DP2––Bosch / PlatinumW5ACW5ACWR8DC4WR8DC4–ChampionRL82YCRL82YCRN12YCRN13LYC–Denso IridiumIWF22IWF22IW16IW16IWF22–––.––SplitfireSF412CSF426ESF98E–. Interesting post Jack.I was at my local HD dealer recently to buy, among other things, a new set of plugs.Out of superstition, the only plug I've been running for years has been their 5R6APP, (Platinum Plus/evo 1340). I was surprised and also disappointed to find they now only stock the standard 5R6A. No premium plugs for evo's any longer.Makes me feel 'old'.I reluctantly bought the standard/base plugs.Going forward, I'll either order my HD branded platinums online, or switch to Autolite or Bosch platinums when the time comes.After closer inspection, the writing on the standard HD plug insulator resembles a Champion.
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I'd almost bet they're indeed Champion plugs, rebranded. Interesting post Jack.I was at my local HD dealer recently to buy, among other things, a new set of plugs.Out of superstition, the only plug I've been running for years has been their 5R6APP, (Platinum Plus/evo 1340). I was surprised and also disappointed to find they now only stock the standard 5R6A. No premium plugs for evo's any longer.Makes me feel 'old'.I reluctantly bought the standard/base plugs.Going forward, I'll either order my HD branded platinums online, or switch to Autolite or Bosch platinums when the time comes.After closer inspection, the writing on the standard HD plug insulator resembles a Champion. I'd almost bet they're indeed Champion plugs, rebranded.Pete, they are made for HD by Champion to HD specsIn the 70-80s the ground strap was a bit wider abd thicker and the ceramic ribbes were a bit bigger to disapate heatA spark plug lives in a hostile place, it has to seal compression, disapate heat and light the fireOur tests showed no ohm change with the platnum plugs, if u cant find the HD ones try Autolite or NGK the same quality plug cheaer and checks out for ohms also.