4
Starting an engine with the “HS” Carburetor involves
the same methods used in a conventional float feed
carburetor.
When starting a cold engine, place the choke shutter
in the closed position and throttle shutter in a cracked
or open position. As the engine is cranked, engine
suction will be transmitted to the diaphragm fuel
chamber through both primary and secondary idle
discharge ports as well as the main fuel discharge
port, creating a low pressure area on the fuel side of
the main diaphragm. Atmosphere air pressure on the
opposite side will force the main diaphragm upward
causing the diaphragm button to depress the inlet
control lever, overcoming inlet tension spring
pressure, permitting fuel to enter through the inlet
seat, then into the fuel chamber side of main
diaphragm, up through the idle and high speed fuel
supply orifices and channels, and out the discharge
ports to the engine.
When engine is idling, throttle shutter is partially
cracked. Engine suction is transmitted through the
primary idle fuel discharge port to the fuel chamber
side of main diaphragm via the idle fuel supply
channel. Again, the main diaphragm is forced upward
by atmospheric pressure, depressing the inlet control
lever overcoming inlet tension spring pressure and
permitting fuel to enter through inlet seat, and filling
the fuel chamber. Fuel is then drawn up through idle
mixture screw orifice and delivered to the engine
through primary idle discharge port.
OPERATIONAL DATA
STARTING (CHOKE) OPERATION
IDLING OPERATION
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