927645 Sprocket shaft extension only

This MCS sprocket shaft extension is a precision-made replacement part for the later ironhead Sportsters. It is designed to fit 1974 to 1976 XL Sportster models, specifically those produced from Late 1974 onwards. As a direct replacement for OEM part number 40377-74, it ensures that your primary drive spacing remains within factory specifications. Over time, these extensions can show wear or damage that affects the alignment of the compensating sprocket. Replacing it during a primary teardown is a smart move to prevent future drivetrain issues. It is built to handle the mechanical stresses of the Sportster's power delivery.