Mercury - Quicksilver 823426A1 Carburetor Repair Kit (4-Barrel) Rochester Quadra-Jet MerCruiser GM Sterndrive & Inboard Engines 823426A1. Overview. If your engine is running rough, idling unevenly, or burning more fuel than usual, it might be time to rebuild your carburetor. The Quicksilver 823426A1 Carburetor Repair Kit brings your Rochester 4-barrel Quadra-Jet carburetor back to factory condition. Designed for MerCruiser sterndrive and inboard engines built by General Motors (305, 350, 427, 45