Primary

Harley-Davidson primary parts include the covers, drive components, service parts and hardware used around the motorcycle's primary drive system. The category includes inner primary covers and outer primary covers, primary housing components, inspection covers, derby covers, mounting kits, bearings, seals, drain tubes, breather hardware and cover fasteners. These components help enclose and support the primary drive assembly while providing access for clutch, chain, belt and related service work. Harley-Davidson also identifies primary covers as components positioned over the primary drive, with model-specific mounting arrangements and finishes available across different motorcycle platforms.

The selection also covers the mechanical components inside the primary system, including primary chains, primary chain tensioners, adjusting shoes, chain adjusters, connector links, compensator sprockets, sprocket retainers and primary bearings. For motorcycles using belt-driven primary systems, the category includes primary belt drive kits, front pulleys, belt drive pulleys and open or enclosed belt-drive components in configurations such as 8mm, 1-1/2-inch and 3-inch systems. Products from Hayden, Diamond Chain, Belt Drives Ltd., BDL, V-Twin, Drag Specialties, Feuling, Baker Drivetrain and other manufacturers cover different primary-drive designs and service requirements. Harley-Davidson service documentation also lists primary housing components such as chain tensioners, bearings, seals, bushings, drain plugs and primary cover gaskets.

Service and rebuild components make up another important part of the category, including primary cover gaskets, gasket and seal kits, inner primary seals, O-rings, mounting hardware, locking tools, bushings and replacement compensator springs. The product range spans early Harley-Davidson models as well as Sportster, Dyna, Softail, Touring, Twin Cam and Milwaukee-Eight applications, with model-specific primary covers and gasket configurations available for different generations. Primary cover styles also range from black, chrome, polished and raw finishes to finned, vented, billet and custom designs, while derby and inspection covers provide additional options for primary-area service and customization.