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 e. CHOKE SYSTEM:
The choke system is used during cold
the suction on the nozzle (14) so
starting and the warm-up period. Under
additional fuel will be drawn into the
these cold conditions it is necessary
manifold.
As soon as the engine fires
to supply an additional rich mixture of
and runs the rich mixture must be
f u e l a n d a i r , a s o n l y t h e "l i g h t e n d s "
rap idly reduced to prevent stalling.
or more volatile port ions of the fuel
This change in mixture is accomplished
by the operator positioning choke valve
will vaporize with the manifold and air
temperatures at these cold conditions.
to provide the proper mixture. However,
a few degrees movement of choke valve
Consequently it is necessary that a
(25) will make a big change in mixture
large quantity of fuel be available so
that
there
will
be
enough
"light
ends",
strength and help reduce sensitivity of
to combine with the air to form a
the choke valve (25) position. Use is
combustible mixture for starting the
made of a spring loaded relief valve
engine.
(26)
in
many
applications.
This
valve
opens automatically with engine speed
The function of the choke valve (25) is
and load and eliminates a great deal of
to restrict amount of air that can
manipulation of the choke on the part
enter the carburetor and to increase
of the operator.
1-17
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