Disassembly

Fig. 1 Typical Exploded View Of Hitachi MR08 Carburetor:

Fig. 2 Jet & air bleed identification:

Keep all components in order by sub-system to aid assembly. Note installation position of all calibrated components, keeping primary and secondary system components separate, so that they can be installed in proper position.
1. Disconnect fuel line at inlet and vacuum hoses from choke piston, secondary throttle actuator and idle-up compensator, then remove hoses, Fig. 1.
2. Remove bolt securing accelerator pump lever, then remove lever and actuating link.
3. Remove bowl vent solenoid and air horn retaining screws, then separate air horn from carburetor body.
4. Withdraw float hinge pin, then remove float, needle valve and seat, and fuel filter from air horn.
5. Remove primary and secondary slow air bleeds from air horn.
6. Remove choke thermostat housing and thermostat, choke piston assembly, accelerator pump and MC solenoid from air horn.
7. Disconnect return springs, then remove micro switch and bracket assembly. Do not remove micro switches from bracket.
8. Remove lock plate and float bowl drain plugs, then the primary and secondary main jets, inserting screwdriver through drain plug holes.
9. Remove accelerator pump spring and check ball, then the injector spring and weight.
10. Remove bleed orifices and jets from body, Fig. 2, noting installation position.
11. Remove fuel cut solenoid, secondary throttle actuator diaphragm capsule and idle-up compensator.
12. Remove float bowl sight glass retainer, sight glass and seal.
13. Remove screws securing throttle plate, then separate throttle plate from body. Note installation position of serrated washers for assembly.
14. Remove pin sealing idle mixture screw as outlined under ``Adjusting Screw Pin Removal.''
15. Turn mixture adjusting screw in (clockwise) until lightly seated, recording number of turns necessary, then remove screw.