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CARBURETOR
39
=
enters :ro-
··e •
e·
ooe
·
g
<D
:
~
:::
-
~
e
ou
side
of
·
r-e
• s:::-e
jp
wh
ere
= ::::
::::-d then en
ers ·-e ::: eeo
hol
e
@
of
-
?'
On he
oi
e·
o"'d,
the
fuel
f
rom
:::-
::.-::~
her
@
a
fter being me ered
by
the
pilot
:::
::::-o
meter
ed
again
at
the iet
area
@
of
-=
~
=~·
je
@,
mix es with
the ai
r from
the bleed
-:: e
g
within
the
slow iet
a nd is
sprayed out
at the
::::-
om of
the throttl
e
val
v
e
@
from
the
pilot outlet
2
·o mix
with
the main flow of air from the cor-
:;_·e·or
air
inlet
<D
and
is
then taken into the engine.
•
f
OAT
CHAMBER
I
is
nec essary
for the carburetor
to
supply the
::·oper
fuel mixture for
the respecti
ve
throttle
opening
::-d
engi
ne
speed;
in
order
to
do
this,
the
fuel
level
be
maintained
at
a constant
level.
It is
t he
:
ction
of
the
float
chamber to
perform this
task.
The
DP type carburetor
incorporates
o filter
i
n
the
"'oo
chamber to prevent entry
o
f
dust.
The
fuel
from the tonk
flows
thro ugh the
groove
H
in
the
fuel
cock, enters the
strai ne
r co
mpartment
~
wher
e the dust and foreign
matters
i
n th
e
f uel
o
r
e
a
lowed
to
settle, passes thro
ugh th
e filt er
@
and then
e n'ers
t
he float chamber
@.
As
the fuel
lev
el
i
n
the
"'o
o
chamb
er
rises, t
he fl
o
at
@
becomes bouyant
::
d
applies
pressur
e
against
the
v
alve
spring
@
to
overri
de
it
and
then fo rces
the
fl
o
at valve
@
against
· e
valve seat
@
to stop
the flow
of
the fuel.
hen
the
fuel in the float
chamber
@
is
consumed,
·.
causes a
lowering
of
the fuel level and a con.
seque nt
lowering
of
the float
@,
this causes the float
·alve
@
t
o
unseat and permits the
fuel
to enter the
"'oa
t
chamber.
This
process
is repeated to maintain
a
constant fuel
level in the float
chamber.
A
spring
:g
is
incorporated between the
float
and the
top
of
. e flo
at
valve
to prevent
the oscillation of the float
. alv
e and
reduce wear
to the
valve seat
@.
Further,
·
o
or
event
overflowing of the carburetor
and causing
·
~e
fl
o
o di
ng of
the
cylinder
due to
tilting or
the float
.
ol
e
sticking open,
an
overflow
pipe
is incorporated
·o
drain
o
ff any
fuel which
exceeds
the
critical
fuel
e
..
e
l.
In
additi
o
n a static air vent
tube
is
located in the
:- a
chamber
and is vented at the front cover
to
-
o·
ain
the air pressure in
the
float chamber always
::o-
.a
nt
with the outside
atmosphere
and whi
ch
is
-
~-
a'fected
by
riding speed or outside wind condition.
OKE
(STARTING)
ri
ng
cold weather
starting,
it may
be necessary
_
·~·tia lly
use a rich fuel
mixture.
For this
purpose,
::::
c o
e val
ve
@
is
incorporated.
The
choke valve
::: ·s
cl
o
sed by
raising the
choke
lever
@,
this
· e_ •·
s
the air
a nd
allows the
fuel sprayed
from the
·
eeo e
je
®
to
enter the engine as a rich
fuel
-
x ·
e.
@
Spring
:§)
eedle jet
@
Pilot outlet
Figure 3-95.
Carburetor
cross
secti
onal diagram
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