O.S. Carburetor Rotor 70R FS155A-PTower Stock# OSMG3726 • Manufacturer Stock# 42581200
Notes from our tech department:
O.S. FS155A-P 4-Stroke Engine.
This rotates inside the carburetor body to adjust fuel air mixture.
One Carburetor Rotor - key #2 on carb part list
This is the cylindrical piece that goes inside the carb body.