Zundapp 281 - Page 42

Carburettor Maintenance
From
time
to
time,
the
carburettor
should
be
rinsed
out
with
petrol
and
thoroughly
cleaned.
While
this
is
done,
check
that
all
parts.are
in
perfect-condition.
Replace
worn
float
needles,
needle
jets
and
jet
needles,
as
well
as
throttle
slides,
since
these
govern
engine
performance
and
fuel
consumption.
On
carburetors
with
separate
starter
jet
assembly,
test
that
starter
piston
has
tight
seal.
The
air
filter
should
also
be
rinsed
at
regular
intervals
in
either
kerosene
or
petrol.
After
cleaning,
coat
the
filter
mesh
with
oil.
Where
a
screwed
hose
union
is
fitted,
take
this
off,
draw
out
the
filter
element
and
clean
it,
slacken
the
connector
nut
and
take
off
float
cap.
On
carburettors
with
side-
mounted
float
housing,
slaken
the
two
screws
on
the
cover,
take
off
the
cover,
then
take
float
from
housing.
The
float
should
drop
by
its
own
weight
from
its
suspension
on
to
the
bottom
of
the
float
cap,
so
that
it
can
readily
be
lifted
out.
The
float
needl@
can
then
be
removed
after
taking
off
the
spring-loaded
retaining
clip.
On
some
versions,
the
float
lies
loosely
in
the
cap.
The
forked
part
which
prevents
the
float
needle
from
dropping
out
can
be
taken
off
after
its
fixing
pin
has
been
drawn
off.
Do
not
bend
the
fork
piece
and
check
that
it
lies
horizontally
in
its
top
position.
Never
use
a
sharp,
hard
tool
to
clean
the
needle
seat
or
the
jet
bores,
but
merely
rinse
them
out
carefully,
then
blow
them
out
to
remove
all
liquid.
Do
not
tighten
the
locknut
too
hard,
but
run
it
down
by
hand
only.
Use
only
the
original
sealing
rings
for
the
float
cap
seal.
Take
care
not
to
bend
the
float
sealing
edge,
otherwise
the
float
may
become
displaced
up
or
down
and
no
longer
seal
off the
float
needle.
This
would
lead
either
to
fuel
leaks
or
to
a
partial
or
total
fuel
blockage.
Use
only
absolutely
clean
fuel
and
fill
it
through
a
filter
into
the
tank
to
prevent
trouble
with
the
feed
system.
Before
fitting
the
fuel
hose,
first
allow
a
little
fuel
to
run
through
it
to
drive
out
all
the
air
and
prevent
the
formation
of
bubbles
and
an
airlock
in
the
system.
Special Hints
1. The carburettor is one of the most delicate parts of the engine. Handle all parts
with great care, run down all threaded connections lightly, never use force to
fit any parts of the float into position.
2. Do not use hard, sharp tools to clean the jets. On no account, enlarge nozzle
bores with a reamer or by any other means,
3. Fit only Original BING spore parts to ensure troublefree operation and a long
service life.
4. Ifall your spare part orders, quote part No. accurately and in full. If the num-
ber is not known, quote the carburettor type code, stamped into the casing, or
send old part as a sample.
5. BING carburetors will give excellent service at all times, provided standard good-
quality branded fuels are used, carburettors are kept clean and only Original
BING spare parts are fitted.
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