Mercury - Carburetor Repair Kit 25HP-60HP FourStroke Outboards Precision Fit 8542561. Overview. There's something deeply satisfying about an outboard that runs smooth, steady, and strong - the kind of engine that starts on the first turn and holds a perfect idle while you push away from the dock. The Mercury 8542561 Carburetor Repair Kit helps you get back to that level of performance. Designed for Mercury 25HP-60HP FourStroke outboards, this complete kit replaces worn or leaking gaskets, seals,