The carburetor mixes air with gasoline in the proper ratio for all conditions. 14.7 to 1 by weight is the chemically correct ratio, but engines can work with 8:1 (very rich) to 22:1 (lean burn). For best power, it's about 12:1, but for best economy is is about 18:1. The stock Hitachi carburetor (when in good condition, i.e. not worn out) does an excellent job of providing superb economy but providing a rich power on demand. The Hitachi keeps in within the appropriate range for all throttle openings, temperature and loads. No dyno tuning is necessary. Since it works on airflow, not engine size, the Datsun 1200 Hitachi works acceptably on engines from A10 to A15 without changing the jets. As the airflow changes, the carburetor meters the fuel accordingly. Changing the jets is necessary for fine tuning. If engine modifications (or if major modifications to the induction system are made such as a high-overlap camshaft), then jet tuning is a must.
GENERAL * Category:Fuel System for master article index * Carburetor Overview basic information
TUNE-UP/ADJUSTMENTS * Tune-up * Choke Operation and Adjustment * Float Level Adjustment
REPAIRS * Carburettor Diagnosis troubleshooting * Carburetor Adjustment testing & repair procedures * Carburetor Repair Rebuild kit * Carburetor Specifications stock jetting & settings info * Carburetor Parts * Fume Control * Vacuum Leaks
JET RE-TUNING * Carburetor Tuning * Jets & air bleeds for part Hitachi
AFTERMARKET CARBURETORS and SWAPS * Choosing A Carburetor * Carburetor Sizing * Carburetor Suppliers * Hitachi DCH340 * Weber DGV "32/36" * Weber DGAS carburetor "38/38"
SIDEDRAUGHTS * Weber DCOE carburetor * Dellorto DHLA carburetors * Mikuni PHH carburetors * Hitachi Twin Carb factory Datsun setup
DCG286: 28 mm secondary bore - A10 engine
16010-M0101 DCG286-4A E10 16010-M0102 DCG286-4B E10 (from '70-11) 16010-M0103 DCG286-4C E10 (from '71-6) 16010-M0104 DCG286-4D E10 (from '71-9) 16010-M0900 DCG286-6 E10 16010-M0901 DCG286-6 E10 (from '70-11) 16010-M0902 DCG286-6B E10 (from '71-9)
DCG306 for A12 (manual choke)
16010-M1500 DCG306-6 E10 16010-M1501 DCG306-6A E10 (from '71-9)