The Craftsman 631304B Engine Carburetor Assembly helps deliver the proper fuel and air mixture needed for reliable engine combustion and operation. This replacement carburetor assembly regulates fuel flow and combines it with incoming air before supplying the mixture to the engine. Proper fuel metering supports smooth starting, steady performance, and consistent operation. Replacing a... https://www.wholetoolbox.com/craftsman-631304b-engine-carburetor/631304B.html