517773 Flywheel thrust washer set, bronze

These bronze flywheel thrust washers from MCS are essential for a proper bottom-end rebuild on early Sportsters. They are designed to fit 1957 to 1971 XL Sportster models and are intended for use with aluminum retainers. These washers sit between the connecting rods and the flywheels to maintain the correct side play and prevent excessive wear on the rotating assembly. They are a direct replacement for OEM 23972-57A and are sold as a pair. Using high-quality bronze washers ensures a low-friction surface that can withstand the heat and pressure inside the crankcase, keeping your Ironhead's bottom end tight and reliable for years to come. They are a critical part of any vintage Sportster engine overhaul.