Tillotson Choke Shaft replaces or repairs the assembly in your Tillotson carburetor. 

The choke mechanism works by closing off outside atmosphere allowing the engine’s vacuum to pull fuel from the low side circuit to allow enough fuel to start the engine. 

26-949 OE Tillotson Choke Shaft & Lever fits HL-166B, HL-166C, HL-292G, HL-366A, HL-371A