The MTD 751-16046-4 Trimmer Carburetor helps deliver the proper fuel and air mixture to the engine for smooth and consistent operation. Designed as a replacement carburetor, it mixes fuel with incoming air and supplies the mixture to the engine for combustion. A properly functioning carburetor can support reliable starting, steady engine performance, and consistent fuel delivery durin... ttps://www.wholetoolbox.com/mtd-751-16046-4-trimmer-carburetor/751-16046-4.html