The Tillotson Fulcrum arm lifts the fuel inlet needle to enter the high and low-side fuel circuits. That means the fulcrum arm can impact the fuel flow and tune of the carburetor.

Fulcrum Arm Height is the measurement between the carburetor gasket surface to the tip of the fulcrum arm.

– Factory Fulcrum Arm Height is typically set at .085″.

– For most gas carburetors, we set the fulcrum at .075″ using our 705 EC Tillotson Gas Fulcrum Arm Gauge

– For most methanol carburetors, we set the fulcrum at .065″ using our 704 EC Tillotson Gas Fulcrum Arm Gauge

The 155A-23 OE Tillotson Inlet Control Lever/Fulcrum Arm is “uncaptured.” Tillotson Uncaptured Fulcrum arm differs from captured fulcrum arm where the tab rests on top of the inlet needle rather than “capturing” the needle.