Mercury - Weber 4-Barrel Carburetor Repair Kit Carburetion System Precision Marine Components 8M0120193. Overview. If you've ever run an older MerCruiser and felt it hesitate for just a moment when you drop the throttle, you know how much a healthy carburetor matters. Boats from the late eighties and nineties have a certain charm-they're tough, familiar, and full of memories. But they only stay dependable when the carb is sealed, synced, and breathing the way the engine was built to. The Quicksi