CARBURETOR (Cont'd)
Description (Cont'd)
The idle compensator is operated by a bimetal element
[A].
When the carburetor ambient temperature rises during
idle operation, the bimetal bends enough to open the
compensator valve. Now additional air, from the air horn,
can
flow through the air passage directly to the intake
manifold. This
leans out the mixture to make up for added
gasoline vapor coming from the
float chamber.
The main metering system functions as follows [B]:
The wider the throttle
valve opens, the faster the air flow
is
in
the venturi. As the vacuum becomes greater, the
main nozzle will inject fuel.
The main metering system is provided with the bleed
valve
press-fitting into the inner venturi and the main air
jet.
Fuel metered by the main jet is bled by air from the main
air jet and enters the bleed pipe through the holes. The
main
nozzle flows the fuel into the engine.
If percolation of the fuel is present along the main well,
vapor can escape from the main air jet through outside
bleed pipe, thus preventing fuel from spurting from the
main
nozzle.
Added Sept.
90
-70-8-
B
Primary
Inner Venturi
Main Venturi
,
.....
l-------r-/r-
EHl9712
741, 742, 743, 7430S Bobcat Loader
Service Manual
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