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Yamaha
ENGINES
YAMAHA
1976 AND LATER
E338, SS338 AN D SS433 TWO
CYLINDER MODELS
CONDENSED SERVICE DATA
Engine Model
E338
88338
88433
Bore-(mm) .
. .. . . ... . . .
..
. .
.
....
60
60
68
Inches
......... .......
.....
.
2.362
2.362
2.677
Stroke-(mm)
....
. .. ...
..
.
. ... . .
59.6
59.6
59.6
Inches
..
........ . .. . .... ....
2.346
2.340
2.346
No.
of Cylinders ..
.
.
... .... . ....
2
2
2
Displacement-co
.
.
..
. .
. .
.
..
. .
. . .
338
338
433
Cubic Inches
.
. .
.
.
.
. .
.
...
. .
.. .
20
I).
20.63
26.4
CoolingType .
...
. .. .
... ........
Fr ee Air
"
Free Air
Free Air"
Carburetor
Model....
.
.
..
.
..
.
Mikuni (B)
Keihin
(PW)
Keihin
(PW)"
Number Used
....
.....
,
......
1
1
1
Ignition:
Type
..
. ..
..
,
....
...
.
cm
cm
cm
Timing
BT,_('
..............
1.5-1.7 mm
1.6mm
1.6mm
Spark
P'
,
Li
........................
BR9EV""
BR9EV
BR9EV""
·1
·
Electrode Gap (mm) .
.......
.
0.5-0.6t
0.5-0.6
0.5-0.6
Inch
.
. . . . .... .
.
. .. .. .
..
.
0.020-0.024t
0.020-0.024
0.020-0.024
Fuel/Oil Ratio
....
... ..... .
.
..
. .
Autolube
Autolube
Autolube
"Models prior to 1980 use Free Air cooling. All
1980-1981 models
are equipped with
Axial Fan
.
""Engine models prior to 1978 use Keihin (PW) model
carburetors.
All
1978-1981
models
use
Keihin (BD) model
carburetors.
"""Models prior to 1980 use BR9EV. All
1980-1981
models use BR9ES.
tModels prior to 1979 use
0.5-0.6
mm (0.020-0.024 inch) electrode gap. All
1979-1981 models use
0.7-0.8
mm
(0.028-0.031
inch) electrode gap
.
on E338
models, 2,000
rpm on S8338
Model
Number
MAINTENANCE
models and
1,500
rpm on 88433
models.
Initial fuel/air mixture setting is as
1976
8PARK PLUG.
Selection
of spark
follows:
SS338
155
plug will depend upon type of service
SS433
155
and ambient
temperature.
Standard
Model
Turns Out
plug is given in Condensed Service Data
1977
table
.
Excessively cold weather and/or
1976-1977
8S338
150
light load conditions may require spark
88338
1
8S433
150
plugs of warmer
heat
range. Hard
88433
P/4
usage, heavy loads and warm weather
1978
may require spark plugs of colder heat
1978
S8338
140
range.
SS338
P
/8
8S433
152
8S433
P/2
E338
220
CARBURETOR. A
Keihin
(PW) type
carburetor is used on S8
models
prior to
1979-1981
1979-1981
1978 and a Keihin (BD) type carburetor
88433
1
6
/8
8S433
145
is used on 1978-1981 SS
models.
A
E338
240
Mikuni (B) type carburetor is used on
1978-1981
E338
models.
Carburetor is installed on
E338
1
If carburetor is removed for
overhaul,
a "Y" type intake manifold and provides
refer to LUBRICATION section for
syn
the fuel/air mixture to both cylinders.
Standard carburetor main jet is as
chronizing Autolube pump to throttle
Standard idle speed setting is 1,700 rpm
follows:
opening.
294
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