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That means the fulcrum arm can have an impact on 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". this can be set using our 705 EC Tillotson Gas Fulcrum Arm Gauge.
The 155A-53 OE Tillotson Inlet Control Lever/Fulcrum Arm is "captured." Tillotson Captured Fulcrum arm differs from uncaptured fulcrum arm by capturing the dowel on the needle valve with the forked end of the fulcrum arm. This is for HK Model carburetors and will not work in the HL and HR models