7.
OPERATION OF FLOAT AND DIAPHRAGM CARBURETORS
PRESSI
JRE
DIAPHRAGM CARBURETOR FLOATCARBURETOR
LOW SPEED FUEL ADJUSTING SCREW
HIGH SPEED FUEL ADJUSTING SCREW
FROM
FUEL TANK
IDLE ADJUSTING SCREW
CARB VENTURI
TICKLER BUTTON
CHANGE
IN
CRANKCA
PRIMER PUMP
OVERFLOW
VALVE
JET NEEDLE
ATMOSPHERIC PRESSURE
STEEL BALL
-
"".-
\
'
PRESSURE COMPENSATING DIAPHRAGM CHAMBER
fig.
19
7-1
OPERATION
OF
FLOAT
CARBURETOR
1) Fuel from the fuel tank enters the float chamber through the needle valve, which is kept open while the fuel level is
low.
2)
When the fuel level rises, the float is allowed to move up and lift the arm connected to the needle valve.
3)
The arm lifted
by
the float raises the needle valve, which shuts off the supply of fuel.
4)
When the fuel
in
the float chamber
is
suctioned into the engine through the carb venturi, the fuel amount
is
measured
by
the main je't and the jet needle the fuel level falls low, causing the float to move down.
5)
The falling of the float lowers the arm connected to the needle valve, which admits the fuel to enter the float chamber.
After this, the same operations in 1)
-
5)
are repeated.
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11
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