Iridium Spark Plugs - 1999-2017 Twin Cam, 1986-2020 Sportster Models XS650 Springer Front Ends If you have an OEM-style

If you have an OEM-style thread-in cap that's exposed (not recessed

88" in diameter These don't fit all fuel caps

Heavy duty solid state combined regulator/rectifier unit that replaces the Yamaha OEM regulator AND rectifier on models with separate mechanical voltage regulator and rectifier (points ignition bikes)

the engine will still run

If you are swapping these 40/60 tires onto a motorcycle that wasn't originally fitted with similar tires

Iridium Spark Plugs - 1999-2017 Twin Cam, 1986-2020 Sportster Models XS650 Springer Front Ends If you have an OEM-styleIridium Spark Plugs 1999 2017 Twin Cam, 1986 2020 Sportster Models Iridium electrode is smaller than a standard electrode; requires less voltage Hotter spark and extended spark plug service life compared to conventional plugs Has the distinctive black ceramic with red lettering and gold colored corrosion protected coating on the metal shell Exceed OEM specifications for plug service life Sold as a pair NGK Reference # DCPR7EIX HD Reference # 6R12