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When
the air choke
is
comp
letely closed,
handle
4 is
in
the front
end
position (handle in
the
upp·
e r position)
.
The choke should be
used
on ly
in
case
of
sta
rting
the engine
from
cold.
.
.
One
of the main
.causes
fo.r
premature
wear
of the
cylmders,
pl-
stons, piston
rings
and of the other
fri ction
pr
a
r
ts
of the
engine
is
dust
and
sand that get
inside
the
engine
through
the
carburettors.
The
service life of
the
engine
much
d·
e
pends
on the
good
condi-
tion of
the
air
cleaner.
Air is
cleaned
in the
follow
ing manner:
when
passing
under
the
c.i
r
cleaner
cover, ai
r
is
flung by
the
deflector
(provided on
the co-
ver)
onto the oil bath
surface,
vhen,
suddenly
ohanging
irt.s
direction,
is
f,
e d
into the
air clea
ner
throat filled with a cappon
stuffing.
H
eavi·
e r
particles
of dust, su·cked in by
the air, hit
th
e
oil
surfa.
c e
a
nd settle down
to
the bottom
of
the
oi:J
bath.
The
finer
p articles,
carrired
a1
way by
the
air
flow, are retained in the throat containing
oi
l-soaked stuffing
packs.
From
the
throat
of
the air
cleaner,
the air
is
supp Jired
through
the
air passages to
the
carburettors.
Provided
inside the
a
ir filter
body is
a disk which is
used as an
oil
damper.
Care of Fuel System
1
During
'daily inspection,
make
sure
tha
t
the
tank is
filled with
fue·l
a
nd
the
petrol
lines a-re
properly connected;
also check the
fuel
s
upp
ly
to the carburettors
a
nd
the operation
of tthe
carburettor
throttle
control
drive.
When operating the
motor
cycle, .check the
presence
of oil
in
the
oil bath
of
the
air filt
er.
111:
is
recommended that
the air filte
r
be
wa
-
shed
and the
oil
ch anged
at
the fol
lowing
intervals:
under
very
du-
sty
conditions,
the air
filter
shoul.
d
be
washed, without dismantling,
and
the oil changed after ev.ery 500 km run;
under
normal
condi-
tions,
the
same
should
be
done
every
1000 km.
When
washing
the air
filter
it
is
recommended
to clean
the
gear
box
casing filler.
Wash the
filter
in a
bath
filled
with
kerosene
or
sweet
petrol.
For
'
t
hi
s
purpose
imnnerse the fi
lter
in the bath, rinse the filter and
then
sharply
shake it
up,
Note: The
oil
used
for
the filling
of
the
air
filter
should
be
the
sa
me
as for
the
priming
of the
engine (the
filter
m
ay
be also filled with the used
oil
of
the
same
grade,
provided
this oil
has
been
prelimi
na
rily
filtered).
After
every
2500 km
run, it is advisab le
to remove
t he sludge
from
the
petrol
cock settler;
rinse
and
clean
the fuel filters.
·
.If the
fuel suppl
y
is insufficient,
the
engine
power
drops
sharply,
flashes
appear
in the
carbur·
e
ttor,
and the
engine speed
does
not
cor-
respo
nd t
o
the
given
position of
t he thrott le
control
grip
.
In
this
ca
-
se, first
of
ai"I
check
that
the
vent
holes
in the plug
of
the
fuel
tank
2re not
clogged.
Then,
on
turning
off the
·petrOl!
cock, unscrew
the
settler,
clean and
wash out the latter together
with the fi
lter
con
-
38
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