518115 Sprocket shaft crankcase bushing. std

This sprocket shaft crankcase bushing is a standard-sized replacement for the left-side crankcase bearing race. With a standard outside diameter of 2.0015 inches, it is designed to fit 1940 to 1954 Big Twin models, covering the transition from late Knuckleheads through the early Panhead era. It serves as a direct replacement for OEM 24621-40. Proper bushing fitment is essential for supporting the sprocket shaft and maintaining primary drive alignment. When rebuilding these vintage cases, installing a fresh, precision-machined bushing ensures that the crankshaft assembly remains stable and well-supported under load, preventing premature wear on the main bearings.