The part number 32365-04 corresponds to the Harley-Davidson Gold 6R12G Spark Plug. It is a premium, factory-upgrade component designed to directly replace or upgrade the standard 6R12 original equipment spark plugs. 
Key Specifications & Performance Features
  • Core Material: Built with a gold palladium insert to significantly extend plug lifespan and fight off corrosion. 
  • Combustion Efficiency: Features a tapered tip design that maximizes spark exposure to the air/fuel mixture, ensuring maximum combustibility. 
  • Fouling Resistance: Utilizes a smaller diameter center electrode wire and insulator tip to prevent carbon buildup. 
  • Thermals: Equipped with a copper-cored ground electrode that runs cooler to improve durability over long distances. 
  • Anti-Seize Protection: Manufactured with a specialized shell and thread coating to prevent the plug from seizing inside delicate aluminum cylinder heads. 
Engine Fitment & Compatibility
This part is specifically engineered to fit the following factory Harley-Davidson setups (excluding XR1200 models): 
  • 1986–2022 Evolution Sportster (XL) models
  • 1999–2017 Twin Cam engines