Everything you need to restore an older Mercury 45hp or 50 hp outboard carburetor Sierra parts are engineered to meet or exceed manufacturers specifications. This carburetor kit for Mercury outboards has been assembled . To save time and simplify researching and sourcing individual parts. Compatible with many Mercury 45hp and 50hp outboards manufactured between 1980 and 1986, this re-build kits includes, gaskets, O-rings, jets, and everything else you will need to restore performance and function. All you will need to supply is a clean bench and clean rags. Boaters and techs can be assured a Sierra part will fit right the first time and restore function to OEM standards. Please call 1-800-BOATING with your outboard's serial number (or make, year, and model) and talk with a tech to confirm this kitis correct for your carburetor.