#632615T CARBURETOR, fits TECUMSEH engines 3-5 HP, Stock replacement. We have sold hundreds of these carbs with zero problems. SETTINGS: Initial factory setting is idle mixture (side) 5/8 turn out. High speed adjustment (bottom) 1 turn out. Make 1/4 turn adjustments in or out with the idle mixture screw, set your idle speed, run engine under load and adjust high speed mixture until you are happy with performance.