S&S Cycle 31-0172A – 99-06 BT Stock Bore Crankcase AssemblyBuild your engine on a strong, dependable foundation with the S&S Cycle Black Stock Bore Alternator Crankcase Assembly. Engineered for lasting durability and precise fitment, this crankcase delivers a reliable core for your motorcycle’s engine components. Finished in sleek black, it not only performs but also adds a bold, custom look – ideal for both restorations and custom builds.








