Everything you need to restore a Walbro or Tillotson carburetor used on Mercury outboards For 50 years Sierra has been producing parts engineered to meet or exceed the specifications of marine engine manufacturers and has gained the confidence of engine manufacturers and boat builders to a point of supplying them with OEM parts. Boaters and techs can be assured a Sierra part will fit right the first time and restore function to OEM standards. Designed to work with Walbro and Tillotson carburetors used on Mercury outboards, 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.