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Fuel Tank
Fuel Cock
The
2.5
C
(
5.3
U.S.
pt/
4 .4
Imp.
pt.)
capaci
t
y
fuel
tank also
serves as a luggage car
r
ier.
A
cock
is
inst-
alled
on the fuel
t
ank
to
control the flow
of
fuel
from
the fuel
ta
nk to
the
carburetor.
Fuel is
supplied to
the carburetor by gravity
feed.
The fuel filler opening is made
into
a
tubular
shape
to
prevent the fuel from
surging
out
of the cap
by
vibration.
(Fig. 3 8
)
Car buret
or
The
ca
r bur
e
lo
r
perfor
ms
the
rune t ion of
m
ixing the
fuel
wi
t
h
air in
the properly
propor
t
ioned m
ixt
ure
t
o
form
a
combustable
fuel
air
vapor.
Shown
in
f
igure
3
-
9
is an
at omi zer
sprayer for horne
use.
Air
blown through
t he
pipe A increases
in veloc
ity
as
the
air
leaves the narrow outlet,
causing
a decr
ease
in
pressure.
The
decr eased
pressur
e
draws
the
water
out
of
the
st
and
pipe
8 which becomes
atom
ized as
i
t
is
formed
into a
spr
ay.
The carburetor performs the same
funct
ion,
it
dra ws
in the air
and atomizes
the
gasoline.
The fuel
which
is delivered
from the
tank first
enters the float chambe
r
of the carbure tor.
Fuel in
the
float
chamber is always main tained
at a constant
level
by
the
action of the
float
which
regulates
the v alve.
If
there we
r
e
no
means to maintain
the fuel
level
constant
,
the fuel
will overflow out of
the
float
chamber or else
there
will
be
insufficient
f low of fuel
int
o
the carbure tor.
During
the intake
strok
e
of
the engine,
the inle
t
va
lve
opens,
piston
moves
downward
creating,
nega
t ive
pressure
in
t
he
cyl inder.
The air r ush es
in from the
carburetor.
As
air
f lows through
the
venturi, the velocity
of the
air increases as
i
t
mOVtlS
through
the narrow
throat
and
causes a
decrease
in
pressur
e.
causing
t he gasoline
t
o
be
drawn
out o
f
the
nozzle as
a
sprav
and mixes with
the
passing air
stream. The
volume
of
air-fuel
m
ixt
ure
that
enter
s
the
cy linder
is
regulated by the amount of
opening or closing of the
throttle
valve.
(Fig. 3
-
10
)
The
choke
valve is used
to
permit
the carburetor
to
supply the engine with the rich mixture
required
for
star
t
ing during cold
weather.
The
choke button is
located
at the handle
mounting. (Fig.
3
-
12)
13
@
Fig. 3·8
Fuel t
a
nk
(1)
Fuel
f ille
r
opening
®
Fuel
(~
)
T ool Ki
t
@
Fuel
co
ck
(5
)
T
o ca rbureto
r
Fig. 3-9
Spra
ye
r
(l)
Water
'(2)
'
Fig. 3- 10
Carbur et
or
(!J
A
i
r
r~
;
Fro
m fuel tank
@
Cho
ke
v
al
ve
(4\
Venturi
@
Thr
ottl
e valve
@
Fl
oat
c ham
ber
(?
)
Float
~
Fuel-air mixture
@
Intake st
r
oke
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