Carburetor - HITACHI DFB 2-Bbl: Overhaul: Reassembly

1. Install new gasket to main body. Attach both ends of throttle lever return spring. See Fig 1 . Install throttle body to carburetor main body. Hook throttle valve end of return spring over boss on bottom of main body.
   Fig 1: Installing Throttle Lever Return Spring

   
2. Install throttle body retaining screws with correct style lock washer. See Fig 2 . Tighten mounting screws to 36-60 INCH lbs. (4-7 N.m). Install primary and secondary main jets. Install float bowl drain plug gaskets and drain plugs. Install drain plug lock plate.
   Fig 2: Positioning Throttle Body Lock Washers Install lock washers as shown.

   
3. Install float level gauge seal and level gauge. Install gauge with mark to the inside. Install microswitch assemblies and springs. Check microswitch adjustment. Install jets, air bleeds and plug in original position in carburetor main body. See Fig 3 .
   Fig 3: Installing Jets, Air Bleeds & Plug

   
4. Install check balls, weights and injector spring. Install accelerator pump piston return spring with "U" shaped end down. Install needle valve filter, seat, gasket, needle valve and float to air horn. Adjust float level as necessary. Install primary and secondary slow air bleeds in air horn.
5. Apply silicone grease to mixture control solenoid valve seal. Install new air horn gasket. Install air horn to main body. Install accelerator pump lever. Check accelerator pump lever for smooth operation.

Fig 4: Exploded View of Hitachi DFB 306 Carburetor Assembly