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•
FUNDAMENTAL OF FUEL COCK
11
explains
of
the
cons truction
of
ditiptuagro type
hml
coc
k.
ON:
Normally
u
sotl,
Functions
as an
auto
hiel cor.k
RES:
Aes8rvO
fuel
is
u
sed,
Ft1ncti(l1\s
as an auto
hiol
cock
PRI:
Fuel is dirUCtly ~uppl
ied.
Ooas
not fuoction as
an
a
uto
fuel
cock
ENGINE STOP
CONDITION
\II/hen
1he e11g111(!
i
s
r1ot
running
with
ttrn
h.1vc1
Ir. Lhe
ON
o
r
RES
positio
1
,
,
the h,el ,.•alve
:
. 1:
is
k0Pl io
the
closed
position
by
applyiflU p
rassuro
ood
otih1ing
thP.
ten
sion
or
Sl)M'l!J
\2,
so
that
no
hJ~d
w'ill
flow
to
the carlJurc
to,s
ENGINE RUNNING
CONDITION
When the
t ugine
is
stcuted
,
a
negativl!
pu)SS\1re
•
6
is generated
in
the
d iaphragm
chambt:I'
,;;_t_,
lhro
11gh thP.
vacuum
(009ative
pressun::•
pipe
~
~~
which
is
con
nected
to
t he
carburetor.
and
build
s
up
a
n
egative p,oss~,,e
•
6
w hich
is
l119 h1.i
r
lhan t he
te ns101
1
<if
s
p,lnn
~·;
so
that
the
diaphrJ91
~1
(~';,
is
fo,ced
to
open
1he
fuel valve
(r•
anti
lhus
allow the
f
uel to
flow to the
c arbu1t1l0
1
S
•
~
,
"PRI"'
POSITION
When
the
fuP.I valve
~]
IS
$Cl
a
t
the
PRI
position, fuel UOINS
to
the
ca,1.lurotC>f
S
di,ectly
because
that
the
p
•<il1'11sion
lnc;ued
o
n
the
levM
e
nd
p
ushas
back.
the
fuel
valve
t
1
•
mechanically
againsl
t he
s,:,ring
t
e nsion, whether the
e
ngine is
running
01
not,
thm ugh
the
RES
s,de
ruel
filte
r
and
f
uel
valve
clea,anc:P..
l h<:
PRI
position is
used
whe
n
the
cad>~•,etor
h
ave
little
01
no
fuel.
for
example,
when fillir1~
the
fue
l
tank
for
t
lie
f irst
time,
C>r w
hen
the
motorc ycle
has
I.limn left
unos~d
for
a
lonu
l
ime,
or
when
t
he CJrbur"Olors
have
h l:!P.n
disassembled
and
repairl:!d.
Shih
tho
lever
to the
ON
positior1 w
t,<:n
t he engine
be9i11s
to
run
smoothlv.
FUEL ANO
LUBRICATION
SYSTEM
4-2
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