Mercury - Quicksilver Carburetor Repair Kit For MerCruiser Engines with MerCarb 2-Barrel 804844002. Overview. If your MerCruiser engine is running unevenly, idling rough, or burning more fuel than usual, it may be time to give the carburetor some attention. The Mercury Marine 804844002 Quicksilver Carburetor Repair Kit provides everything you need to rebuild and refresh the newer MerCarb two-barrel carburetors found on many 4-cylinder, V6, and V8 MerCruiser sterndrive and inboard engines built f