The Tecumseh 640340 Lawn Mower Carburetor helps maintain the proper fuel and air mixture for smooth, dependable engine operation and consistent mowing performance. Designed as a replacement carburetor, it regulates fuel delivery to support reliable starting, steady idling, and proper combustion. Replacing a worn or faulty carburetor can help address common engine issues such as diffic... https://www.wholetoolbox.com/tecumseh-640340-lawn-mower-carburetor/640340.html