5.5
Section 5
Fuel System and Governor
5
Fuel Shut-Off
Solenoid
High Altitude Operation
ȱȱȱȱȱȱȱŗśŖŖȱȱ
ǻśŖŖŖȱĞǯǼȱȱǰȱȱȱ¡ȱȱȱȱ
over-rich. This can cause conditions such as black,
¢ȱ¡ȱǰȱęǰȱȱȱȱȱ
power, poor fuel economy, and poor or slow governor
response.
ȱȱȱȱěȱȱȱǰȱȱ
high altitude jet kits are available. The kits include
new main jets, slow jets (where applicable), necessary
ȱȱȬǯȱȱȱȱȱȱȱȱ
correct kit number.
Fuel Shut-off Solenoid
ȱȱȱȱȱȱȱȬěȱ
ǯȱȱȱȱĴȱȱȱȱǯȱȱ
ȱśȬŚǯȱȱȱȱȱȬȱȱȱ
ȱȱŗŘȱȱȱȱȱȱǰȱȱ
ȱĚȱȱȱȱǯȱȱȱȱȱ
ȱȱ¡ȱȱȱȱĚǯ
Figure 5-4. Fuel Shut-off Solenoid.
ȱȱȱȱǰȱȱȱȱȱěǰȱȱ
can determine if the solenoid is functioning properly:
ȱ ŗǯȱ ȱěȱȱȱȱȱȱȱȱ
carburetor. When the solenoid is loosened and
removed, gas will leak out of the carburetor.
Have a container ready to catch the fuel.
ȱ Řǯȱ ȱȱȱȱȱȱȱȱȱȱȱ
ȱȱěȱȱȱǰȱȱȱ¢ȱ
remaining fuel. Take the solenoid to a location
with good ventilation and no fuel vapors present.
ȱȱȱȱȱŗŘȱȱȱȱȱȱ
ȱȱȱȱěǯ
ȱ řǯȱ ȱȱȱȱȱȱȱȃěȄǯȱ
Connect the positive power source lead to the red
lead of the solenoid. Connect the negative power
source lead to the solenoid body.
ȱ Śǯȱ ȱȱȱȱȃȄȱȱȱȱ
pin in the center of the solenoid. The pin should
ȱȱȱȱȃȄȱȱȱȱȱ
ȱȱȱȱȱěǯȱȱȱ
times to verify operation.
Carburetor Details
ȱȱȱȬȱȱȱȱȬĞȱ
design. The circuits within the carburetor function as
described following:
Float Circuit:
ȱȱȱȱȱȱȱȱ¢ȱȱĚȱ
ȱȱȱǯȱȱ¢ȱȱȱȱĚȱ
ȱȱĚȱȱȱȱȱȱǯȱȱ
ȱȱȱǰȱȱĚȱȱȱȱȱ
pressure will push the inlet needle away from the
seat, allowing more fuel to enter the bowl. When
ȱǰȱȱ¢ȱȱȱȱĚȱȱ
again overcome the fuel pressure, rising to the
ȱĴȱȱȱȱĚǯ
Slow & Mid-Range Circuit:
ȱȱȱȱȱȱ¢ȱȱȱȱ
ǯȱȱȱȱȱȱȱȱȱȱ
the slow air bleed jets, fuel is drawn through the two
main jets and further metered through the slow jets.
ȱȱȱȱ¡ȱȱȱ¢ȱȱȱȱȱȱ
exit to the transfer port. From the transfer port the
air fuel mixture is delivered to the idle progression
chamber. From the idle progression chamber the
air fuel mixture is metered through the idle port
ǯȱȱȱȱȱȱȱȱȱ
ǰȱȱȦȱ¡ȱȱȱ¢ȱȱĴȱ
of the idle fuel adjusting screws. This mixture is then
mixed with the main body of air and delivered to
ȱǯȱȱȱĴȱȱȱǰȱ
ȱȱȱȦȱ¡ȱȱȱȱ
ȱȱę¡ȱȱȱȱȱǯȱ
ȱȱĴȱȱȱȱȱȱȱ
becomes great enough so the main circuit begins to
work.
Main (High-Speed) Circuit:
ȱȱȦȱȱȱȱȱȱȱ
ǯȱȱȱȱȱȱȱȱȱȱ
the four air jets, fuel is drawn through the main jets.
The air and fuel are mixed in the main nozzles and
ȱȱȱȱ¢ȱȱĚǰȱȱȱ
mixing of the fuel and air occurs. This mixture is then
delivered to the combustion chamber. The carburetor
ȱȱę¡ȱȱDzȱȱȱȱǯ
Comments to this Manuals