Carburetor Overview

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The Datsun 1200 uses a Hitachi carb, model Hitachi DCG-306 (manual choke) or DCH-306 (automatic choke). This is a modern, two-barrel progessive linkage carburetor. It used bore sizes of 26/30 and venturis of 20mm (primary) and 26mm (Secondary). However, the Datsun 1200 GX models used twin Hitachi 38 sidedraft carburetors with a manual choke system.

Model Numbers

Hitachi DCx model numbers indicate the primary bore * secondary bore sizes:

Hitachi DCG306
  G = manual choke | H = automatic choke
 30 = 30mm secondary bore
  6 = 26mm primary bore

Links

Hitachi DCx carbs were used on, among others:

*  DCG286 1967-1970 Datsun B10
* #DCG306 1970-1975 Datsun B110
          1973-1980 Datsun B210
          1977-1983 Datsun B310
* #DCH306 1972-1973 Datsun B110 North America
*         1973-1975 Honda Civic EB (1200) & EC (1500) engines
*         1970-1985 Mazda 323 TC (1300) & UC (1500) engines
*  DCH340 1973-1980 Datsun L-series
*  DCF306 1981-1983 Datsun Japan B310 (starting October 1980)
          Australia Datsun B310 Sunny A15
*  DCR306 1981-1982 Datsun USA A12A/A14/A15 (B310 USA)
*  DFP306 1983-1984 Nissan USA Sentra "MPG" E15
*  DCZ306 1983-1988 Nissan Japan C22
          1986-1987 Holden Astra E16
          1982-1984 Nissan Prairie M10.E15
*  DCT306 1983-1985 Ford Laser
* #DFC306 1989-1994 Nissan Sunny Truck

ID boss:

See Also:

• Fuel System Category Page
• Carburetor Adjustment
• Carburetor Repair
• Carburetor Specifications
• Carburetor Diagnoses Diagnoses and Corrections
• Carburetor Swaps
• Weber 32/36 Carburetor
• Weber DCOE carburetor

NOTE: The B10 Datsun 1000 used a smaller carb, the Hitachi DCG-208.

DCG306

DCG is the manual-choke series.

Album 14000 Album 14001 Album 22275

DCG vs DCH (1971 vs 1972 USA)
Album 15575

DCH306

1973-1982 DCH is the Automatic Choke series. It had mechanical secondary linkage.

DCR306

DCH-306 with vacuum-operated secondary throttle. 1981-1982 USA models.

New features
* Removable fuel bowl sight-glass 
* Vacuum-Secondary linkage
* Externally-vented fuel bowl

Post 484291

DFC306

Feedback carburetor DFC306 is the carburetor on 1989-1994 JDM A12 engines. It requires a special water heated Intake Manifold and ECU control for the electronic feedback (closed-loop mixture control).

See main article: DFC306

DCK

1967-1970 Datsun 510 (1300) DCK looks similar to DCH340 with a large bolt-on glass float cover.
Album 16097