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Inspection Of Carburetor Components - Ducati 900SS Workshop Manual

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Table of Contents
-
-
CARBURETOR
Inspection of
carbure
tor
components.
Todoy's
intricate
carburetors
must
be
carefully
inspected before
reassembly
to
ensure
proper operation
.
The
small passages in the
carburetor body
must
be
clear of any
foreign
matter,
and
the
body
itself must
be
inspected
lor
wear ond
damage.
A close inspechon must also be
done
on
a
ll
componen
t
ports. Remember,
by
understanding the
opcro llon o
f a
carburetor.
during
your
initial
diagnosis.
you w
rll
be
able
to precisely
prnpornt which
circurt rs
causing the
problem.
FLOAT-VALVE
ASSFMBLY:
Check for dirt in the assembly,
and
wear
on the
flool-volve
needle w here
it
contacts
the
floot·volve seal.
SLIDE AND
SLIDE
BORE
O
F
THE C
ARBUR
ETOR
BODY:
C
heck
the
side
of
the
slide
for
Iorge
scratches and w
ear
C
heck
the
slide
bore of the carburetor
body
for
damage
and
wear
PllOl
SCREW:
Check
prlot·screw
toper
lor damage from
its berng
overtighten<.'Cl
Replace
the
screw
if
rl
is
damaged
FLOAT
ASSEMBL
Y.
C
heck the
float
assembly
lor
d
amage
that
would
rend er it
inoperable.
JET
NEEDLE
:
Check the
needle for wear marks or
bends.
Either
condition
warrants
replacement.
NEEDLE
JET:
Because
it
rs diflrculllo check a needle
jet
for
wear,
w
e
must
assume
that,
if the jet needle
is
w
orn
,
the
needle
jet
is
a lso
worn
.
Both must
then
be repla
ced.
DIAPHRAGM
AND
ACCELERATOR-PUMP
CARBURETORS:
Diaphragms
must
be
checked for
tears.
crocks,
holes.
or other
damage.
GASKETS:
Gaskets
should be replaced whenever the carburetor
rs
disassembled
O
·RIN
GS
All
O
·rr
ngs
u1
the
carburetor should
be
checked
for
damage tha
t
could
cause
o
leak.
MAIN
JET
:
C heck
the
morn
jet
for
any type
of
blockage.
PILOT
JET
:
Check rhe ptlot jet carefully
for
blockage. When
replacing
the piloljel, make
sure the correct
type of
pilot
jet rs
used.
otherwise poor
performance
w
ill result
AIR JET
CIRCUITS
C
heck
the
a
ir
tel
c
rrcur
ts lor
b lockage.
TIPS:
On some
carbureto rs
tt
IS
r ossrble
to
physically
interchange the pilot and
main
air
jets.
II this
is
done,
a
very
rich
cond•hon at
idle.
and
leaner·than·normol
condition
at
midrange
and high
speed. will
occur
Do
notmterchonge
the pilot
and
main
air
jets
STARTING·ENRICIICNCR
PLUNGER·
C
heck
the
p
lunger
lor
wear
along
the
sides
Check
the
rubber
seal
on
the
bo11orn
for
w
ear
and
da mage
. . .
NOTE: The
narrow nozzle in the joint must
be
connected to the small
vacuum
. . . .
line
coming from the
mixture
control
valve.
l his
sharp rise
in the vacuum
octrvates
the
vacuum chamber
in
the rr••xture
control
valve.
The
vacuum in
this
chamber
pulls
o
valve
in the
fresh-air
chamber
off its
seat.
This allows
fresh
air
Ia
pass
rnto
the
intake
tract by way
ol
the
fresh-air
line. The
additional
a
ir
leans
out
the
rich
o
ir·fucl
mixture:
entering
tht!
combustion
chamber. This
causes
o beller burn
o
f
the
a
ir
/fuel
mixtur
e.
and
very
ltttle
unburned gas will enter
the
e..:housl syslern
.
GJDon>
o9'1d o•eo
n)
noo:·vo:ve
needll'
nl)rl·.xr,o,-,~r
0 .57

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