A-B1691449-AI CAMSHAFTOne New Aftermarket Replacement Camshaft Fits Briggs & Fits Stratton Small Engines This aftermarket replacement camshaft fits a wide range of Fits Briggs & Fits Stratton (B&S) 4 cycle small engines used in lawn mowers, pressure washers, chipper shredders, and generators. The camshaft opens and closes the intake and exhaust valves and is driven by the crankshaft gear, controlling valve timing for smooth engine operation and peak power output.