The Stihl WTF-2A carburetor (code 1143-120-0601) is an original spare part for Stihl MS 231, MS 251 chainsaws. Includes Inlet Pin, Inlet Adjustment Rocker, Spring, Axle, Hemispherical Head Screw, Gasket, Adjustment Diaphragm, Adjustment Protection Cover, Screw, Pump Diaphragm, Gasket, Pump Cover, Screw, Minimum Adjuster Screw, Main Adjuster Screw, Boot, Idle Adjuster Stop Screw, Boot, Throttle Reduction Control Lever, Lock Washer, Retina, MN Ring