The Tecumseh 640353 Engine Carburetor helps provide the proper fuel and air mixture needed for smooth engine operation. This carburetor meters fuel and combines it with incoming air before delivering the mixture to the engine for combustion. Proper fuel mixture control supports reliable starting, steady idling, and consistent engine performance during use. Replacing a worn or damaged ... https://www.wholetoolbox.com/tecumseh-640353-lawn-mower-carburetor/640353.html