Yamaha SL338D Service Manual page 86

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ENGINE MAINTENANC E
-
Carbu retion and Fuel System
l
"
\
F ig.
7-16
The f uel level var ies from
refer to t he table below.
rnod el to model . F or detai Is
(A is contacting surface)
SW433C
+ 0 + 0
A - 1 0
mrn
(A - 0. 39 4
in}
SL338D
+ 0 + 0
A_ 10
rnm
(A_ 0.394
in }
SL433B
A + 0 + 0
- 10
m111
(A_ 0.394
in}
EW433C
A+ 0 + 0
- 10
mrr.
(A_ 0.394
in)
EL433B
+ 0 + 0
A_
10
mn1 (A_ 0. 394 in)
GP433B
A+2
-5
n1m
(A + 0.078 . }
-0.197
1
n
GP338
A+2
+ 0.078 .
mm (A_
0
_ 1 97 1 n}
-5
7-2-4
Idling Speed Adjusb11ent
•
The idl ing speed should be set according to the fo l lowing
t able .
' I
Idling r .p .m .
SW433C
1,800
r .p.m .
SL433 B
1,800
r .p .m .
EL433 B
1,800
r .p.m.
EW433C
1,800
r .p.m .
GP433B
2,200 r.p.m .
SL338D
1,800
r.p.m .
GP338
2 ,400 r .p.m.
-
For smooth idling, the slow adjusting screw must
be
correctly set so that an optimu m fuel -air mixture m ay be
fed
to the engine. The setting of the slow adj usti ng screw
will greatly affect the engine performance from st arting to
acceleration in the range of low and m edium speeds.
Turn in or out the slow adjusting screw, and when t he
engine
speed
reaches its maxi mum, back out the screw 1
/8
- 80-
t ur n to enrich the mixture a little .
The fina l adjustment of idling speed is made by the throttle
stop screw (idle speed screw) . The t hrottle stop screw is
closely related to tl1e slow adjust ing screw in the adjust-
ment of id l ing speed. T l1ei r positions cause the engine
speed to increase or decrease, but by turn i11g in and out the
throttle stop screw, the final adjust ment sho uld be done so
that the engine may run idle at specified r .p.m .
7-2-5 Adjustment Sequence is as Fo llows:
(In case of single carbu retor )
{1} Back out the slow adju sting screw from a lightly seated
position, at the sa me time, the setting of the ma in
adjusting screw should be adjusted to factory reco m-
m ended setting.
1
I l
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\
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Fig .
7-17
(2) Start the engi ne and let it warm up .
(3} Increase the engine speed to speci fied r.p.m. by
use
of
the throttle stop screw .
•
1
(@
I
Fig.
7-18
(4)
~urn
the slow adjusting screw in or out
1
/8 turn each
time and when the idl ing speed reaches its maximum
and becomes stable, stop turning the screw. Adjust t he
thr~ttl~
stop screw o nce aga in, and set it so that the
engine rdle at specified r.p .m.
(5 ) Back off the slow adju sting screw
1
/8 turn.