-
-
CARBURETOR
In
spection
of
carbur
e
tor
components.
Todoy's intricate carburetors
must
be
ca
refully inspected before reassembly to
ensu
re
proper operation. The
sm
all passages in the carburetor
body
mus
t be clear of any
foreign matter,
and
the
body
i
tse
lf
mus
t
be
inspected lor w
ea
r ond
damage
.
A close
inspechon
mu
st al
so
be
done on a
ll
component ports.
Reme
mber,
by
underst
anding
the
opc
roll
on
of a carburetor. during your initial
di
ag
nosis. you w r
ll
be
able
to precisely prnpornt
which
circurt
rs
causing
th
e problem.
FLOAT
-
VALVE
ASSFMBLY: Check for dirt in the assembly,
and
wea
r
on
the flool-volve
needle w here
it
co
nt
ac
ts the floot·volve seal.
S
LIDE
AND
S
LI
DE
BORE O F T
HE
C
AR
B
UR
ETOR BODY: Check
th
e si
de
of
the s
li
de for
Ior
ge
scratches
and
w
ea
r Check
th
e
sl
ide bore
of
the
ca
rbure
tor
bo
dy
for
damag
e
and
wear
PllOl
SCR
EW
:
Check
prlot·screw toper lor
damage
from
its
berng
overtighten<.'Cl
Rep
lace the screw if rl is
damaged
FLO
AT
ASSEMBLY. C h
ec
k the float assembly
lo
r dam
age
that
wo
ul
d render it
inoperable.
JET
NEEDLE
:
Check
the needle for
wear
marks
or
bend
s.
Either condition warrants
replacement.
NEEDLE
J
ET
: Because
it
rs
diflrculllo
check a needle jet f
or
we
ar
, we
must
assum
e
th
at,
if the jet needle is w o
rn
, the n
eed
le jet
is
also
wo
rn
.
Bot
h
mu
st
then
be replaced.
DIAPHRAGM
AND
ACCE
LERATOR
-PUMP
CARBURETORS
: Diaphragms
mu
st
be
checked for tears.
croc
ks
, holes.
or
other
damage
.
GASKETS: Gaskets should
be
replaced whenever the carburetor
rs
disassembled
O·RIN
GS
All O ·
rr
n
gs
u1
th
e carburet
or
should be checked for damage that could cau
se
o le
ak
.
MA
IN
JET
: Check the morn jet
for
any type
of
blockage.
PILOT
JET
:
Check
rhe
ptlot jet carefully
for
bloc
kag
e.
When
replacing the pi
loljel,
make
sure
th
e
co
rrect type of pilot
jet
rs
used. otherwise poor performance will r
esult
AIR
J
ET
CIRCU
ITS
C heck the a
ir
te
l c
rrcur
ts l
or
blockage.
TI
PS
:
On
some carbureto rs
tt
IS r ossrble to physically interchange the pilot
and
main air je
ts
.
II
this
is
done,
a very rich cond•h
on
at idle.
an
d leaner·than·normol condition at midrange
and
high speed.
will
occur
Do
notmterchonge the pilot
and
main air
jets
STARTI
NG·ENR
ICIICNCR
PLUNGER
· C heck the plung
er
lor wear along the sides
Che
ck the
rubb
er seal on the
bo
11
o
rn
for wear
and
dam
age
...
NOTE
:
Th
e
narrow
nozzle
in
the joint must
be
connected to the small
va
cuum
....
line coming from the
mi
xture control valve.
l
his
sh
arp ri
se
in
th
e vacuum octrvates
th
e vac
uum
chamber
in
th
e
rr
•
•xtur
e con
tr
ol valve.
The
vac
uum
in
th
is chamber pulls o valve in
th
e fresh-air chamber off
its
se
at.
Th
is
allow
s
fr
es
h
air
Ia pass r
nt
o the intake tract
by
way
ol the fresh-
ai
r lin
e.
The a
dd
ition
al
air leans
out
th
e
ri
ch o
ir
·fucl mixt
ure:
e
nt
e
ri
ng
th
t!
co
mbust
ion chamber.
Thi
s cau
ses
o beller burn
of the air
/fue
l mixt
ur
e.
and
very
lttt
le unburned
gas
will enter
th
e
e..:ho
usl
sysle
rn
.
GJ
Don
>
o9'1d
o•eo
n)
noo:·
vo:
ve
needll'
nl)rl·.xr,o,-,~r
0 .57
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