The MTD KH-20-853-35-S Carburetor Assembly, designed to provide the air-fuel mixture needed for efficient combustion in compatible equipment. This carburetor regulates fuel delivery and mixes it with air to support engine starting and consistent performance. Replacing a worn or faulty carburetor can help address starting difficulties and uneven running. Check your engine model and par... https://www.wholetoolbox.com/mtd-kh-20-853-35-s-carburetor-assembly/KH-20-853-35-S.html