The Tecumseh 631921 Engine Carburetor helps regulate the air and fuel mixture supplied to compatible Tecumseh engines for proper combustion. This carburetor supports consistent fuel delivery to help the engine start and run as designed during regular equipment use. It is a practical replacement for a clogged, worn, damaged, or faulty carburetor that may cause starting problems, uneven... https://www.wholetoolbox.com/tecumseh-631921-lawn-mower-carburetor/631921.html