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6. 1
MAINTENANCE
f.
Use
compressed air to clean the individual
nozz
les,
and after
cleaning,
reassemble, rein-
stal
l,
and adjust.
g.
Idling adjustment.
( l)
Idle adiustment
a.
Adjust the
stop
screw
®
so
that
the
exhaust
back pressure is the
sa:ne
for
both
the righl
and left side.
If
the engine speed does not
decrease when
the stop
screw is
screwed
out,
loosen the lock nut and
screw
in
the
cab le
adjuster by
about
one turn.
The
engine
rpm
at this point
is
between
l ,000~
1,200
rpm.
b.
Starting
with
either the right or left car-
buretor, manipulate the pilot screw
CD
and
find the point of highest
rpm;
the
same
should
be done
with
the opposite carburetor.
Turning
the pilot
screw
in
will
give a high fuel air
mixture, turning the
screw
out will give a lean
mixture.
The pi
lot
screw
CD
should
be set
at a point l~Jl/
4
of a
turn out
out
from
full
close.
c.
After completing the adjustment in
paragraph
(bl
abo ve, recheck
the
exhaust
pipe back
pressure on both the right and
left
side
and
if necessary, readjust the stop screw as
was
done in paragraph (al.
d.
Repeat the procedures from paragraph la)
through (cl several times
so
that the
pilot
screw
is
set
to provide the
specified
rpm and that
the same
exhaust
back pressure is obta ined at
both the right and left sides.
(Fig. 6.
27)
(2)
Synchronizing the throttle valve
Make the
ad,ustment
so that
the right and
left throttle valves will both
move
by the same
amount
when
the throttle grip is moved slightly.
This adjustment can be made
by
placing a
hand under the carburetor and noting
the
move-
ment
of
the throttle lever or by observing, the
movement
while
the throttle
grip is slowly
moved and checking to see that the throttle
levers start
moving
at
the some time.
If
odjiust
m ent
is required,
loosen
the
lock nut
(Fig. 6.
28)
and perform the adjustment with
the coble adjuster.
(Fig. 6.
28)
Fig
.
6. 27
Id ling
adjust er
CD
Stop
screw
®
Pil
ot
screw
fig. 6.
2E
Id
l
ing
adjus
tment
fig.
6. 29
Carburetor
cross-section
CD
Valve
seat
@
Valve
@
Float
®
Stop
screw
155
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