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40
Adjusllng the
carburalion
(fig. 23)
The carbyration Is adjusted on a
hoi
eng
in
e
after
th
e
inlet
and
exhau st tapp
ets
have
been set
at
a
correct
distance.
Proceed as fo llows
:
1
With
the carbureto
r
rubber Inlet
manifold reo.
moved,
che
ck
that
bo
th
gas valves open at
the
same
time.
This
is
done by
turning
th
e
thro
ttl
~
g
ri
p and
at the
sa me
time
teeling
with your
tin-
gers on 'he
carburetor slide
s
if
these
open
simul·
taneously
by
the
same
amount.
Shou ld one
valve
open
before
the
other.
corr
ee!
by
setting
screw .
C.
in
fig
. 23 in the
position
where
by turning th
e
throttl
e
g
rip
both
va lves
open
si multaneously.
2
Ad just
the
i
dling speed
by
acling on the
screw
·
0
...
Screwing this in reduces th
e
fuel
flow
and
vic
eversa
i
nc
r
e3ses
It.
T
o adjust,
tighten
the
sc rew
then
undo
it
2
to
2 1/: turns for
the
l
eft
c
arburetor
and
2 1/J. to
2
1/~
turns
for
the
right
carbu retor.
With
th
e
engin
e
revolvin
g
at
about
1000 -:-
1200
r. p.m.
d
isconne
c:
the
plug lead
of
any one of
the
cylinders and lightly turn
screw
-0-
of
th
e
opposite
carbure
tor
to
the
pOSiti
on
wh ich
will
give the
best
idling
spe9d.
i.
e.
until
the eng
ine
re
vs
increase
slightly.
Th
e
same
operation
shou
ld
be
repeated
on the
car
bu
retor of the opposite
cylinder.
This
will
give
a
correct
idling
sp
eed and
prevent eng
in
e
popping.
Min.
engine
speed
Due
to
the
co nstr
uc!i'le
characteris
tics of
this
eng
ine,
the
i
dling
sp2ed
adjustment
should
never
b
e made
wilh th
e engine running
al
less than
1OCO -:- 1200
r.p.m.
A
good
idling
speed
is
obtain
ed
as
foll
ows
;
3
Di
sconnect th
e
right cylind
er
plug
l
ead.
start
the
engine
and en5:ure
that
it slops
after firing
1.·3
strok
es;
If it
di
es
out
earli
er.
or
l
ater
adjust
idlin
g
screw
. E-
until
the
eng
i
ne stops
after
firing
~
or
5
ti
mes.
Repeat
the
sa me
operatio
r,
on th
e
right cylinder
with
the
left
cylind er plug leed
disconnected.
If
th
e
ri
ght
cylinder
Is
nermal.
th,
engin
e
shoul
d
stop
att2
r
firing
.!
-3
strokes.
If
not,
screw
-
:
'"
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