A-B1845864-AI BUSHING-THROTTLE SHAFOne New Aftermarket Replacement Throttle Shaft Bushing Fits Briggs and Stratton (Fits Briggs & Fits Stratton) Engines This throttle shaft bushing is a carburetor component that supports and stabilizes the throttle shaft within the carburetor body. It reduces friction and wear at the throttle shaft bore, helping to maintain an airtight seal, consistent idle, and smooth throttle response. Worn throttle shaft bushings are a common cause of vacuum leaks