The HS40 is a Flat slide Mikuni Carb.
The stamping on mouth of this one reads “T40 6W” . The jets included in it are in the pic to the right. 1) 2)
Trace: • EVO: Suspension • IH: Engine Mechanicals - Sub-09P • 1968 Sportster • REF: Suspension - Sub-02D • 1962 Sportster • W E L C O M E ! • IH: Body Parts • IH: Electrical System - Sub-02A • REF: HD List of Evo Sportster Hardware P/N & Descriptions • REF: Carburetor, Intake Manifold & Exhaust - Sub-01N