Float Unit; Needle Valve - Suzuki GS850G Service Manual

niain jet clogs
up,
the fuel-air mixture
fuel level falls as the gasoline is consumed,
become? Ican. On tlie conrrary, iT the air jet the float and needle will fall
t o
allow gasoline
or bleeder pipe's bleeder hole clogs ~ t p .
the
to flow in.
mixture will become rich. A worn needle jet
or jer needie. or a l o o ~ c
maiti jct, bleeder
pipe,
or needle
j e ~
will also causc a rich
mixi
ure.
Fig. 9-7
FLOAT U N I T
Thc floar u n i ~
consists of
a float
and
needle
valve
, 3
.
etc.
Refer
to
Fi8. 9-8. The
flnnt
tlnil
regulate? the fuel level in the car-
buretors to
ensure
uniform fuel mixing. If the
fuel lcvel
i s
ton
101~.
it i s diffictijf lo dmw the
gasoline and the mixed
gas
will hecnrne lean.
On ihe other hand. if thc fuel
level is too
high.
it is
too
easy to draw the
e:is
and the
mixed gas
will he rich.
Fuei level means the distance from the center
of the carburetor's main bore to the surface
of the gasoline
in
the float chamber. I t is kept
regulated by the opening or closing of the
fIoat. valve. When the gasoline flows
in
through the float valve, t h e fuel level of the
float chamber
rises and the float goes up at
the
same time
to push the needle up.
When the gasoline reaches the required level,
the needle
contacts close
to
the
seat
corn-
plctcty ctopping thc Ilow oi
gns;oline. When
C :
Fuel
i
i J
i
I
r -
-
, I '
I
I
I
i
1 1
1 .I
' I .
I
Fig.
9-8
NEEDLE V A L V E
I f foreign matter is caught between the
valve
seat
and
the needle,
the gasoline will continue
flowing and overflow.
I f
the
seat and
needle
arc warn beyond the
permissible
limits,
similar troubles will occur.
Conversely.
i f
the
needle
sticks, the gasoline
will
not
flow
into
the
float
chamber.
To service and inspect, remove the car-
burcrnrs, Float chnmberl; and floats, and
clean thc float chambers
and
float parts with
gasoline.
I T the needle i s worn as ~ h o w n
below, replace i! toyether will? a valve
seat.
Clean
the
fuel
passage of the mixing chamber
with cornprewed air.