Adjustment Screw Kit for Rotax Max Carburetors. This screw kit allows for fine-tuning the fuel-air mixture into the carburetor from the main jet venturi.
Each Rotax carburetor requires this screw and return spring (which holds tension on the screw). Without it, the proper metering of fuel and air into the carburetor is not possible.
The kit comes with (1) 30 and (1) 31 part as shown in the diagram.