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Specifications - Yamaha EX440D Supplemental Service Manual

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1980
EX440D
3. SPECIFICATIONS
NOTE:
* "".
New specification
(
General
(Compared
with 1979
EX440C)
Model:
Mode
l
(I.B.M.
No.)
*
EX440D (8J7)
Frame
1.0.
&
starting
number
*
8J7-036101
Eng
ine 1.0.
&
starting number
*
SS433-036101
Dimension:
Overa
ll
length
2 ,520
'mm
(99.2
in)
Overall width (std)
980 mm (38.6 in)
Overall height
(w/
w indsh ield)
995 mm (39.2 in)
Engine
Desc ription:
Eng ine type
Fan coo led two-stroke 7
-port
torque
induction,
twin cylinders
Eng
ine
model
SS433
Displacement
433
cc
(26.42
cu.in)
Bore
X
Stroke
68
X
59 .6 mm
(2.68
X
2.35
in)
Effective
compress
ion ratio
7.0: 1
Starti
ng
system
Recoi
l
hand starter
Ignition
system
C.D.I.
Lubrication system
"Auto
lu
be"
oi
l
injection
Cylinder head:
Combustion chamber volume
(with
spark plug)
24.6 cc (1 .50 cu
.in)
Compression chamber type
Dome
+
Squ ish
Head gasket
thickness
0.5
mm
(0.02 in)
Cylinder:
Material
Cast iron sleeves aluminum
Bore size
68 mm
(2.677 in)
Taper lim it
0.05 mm (0.0020 in)
Out of
rou
nd
limit
0.01 mm (0.0004 in)
Piston:
Piston skirt clearance (Measuring point)
0.045
~
0.050
mm
(0.00 18
~
0 .0020
in)
l
(20
mm from piston skirt end)
Piston oversize
1 st 68.25 mm (2.687 in)
2nd 68.50 mm (2.697 in)
3rd 68.75 mm (2.707
in)
4th 69.00 mm (2 .717
in)
Piston pin outside diameter
X
length
r/l18
X
55
mm (r/l0
.709
X
2.17 in)
Piston ring:
Piston
ring design (Top)
Keystone
(2nd)
Keystone
Ring end gap (insta
ll
ed) (Top)
0.35
~
0.55 mm
(0.0
14
~
0.022 in)
(installed)
(2nd)
0 .35
~
0.55 mm (0.014
~
0.022 in)
Smal
l
end bearing:
Type
Needle bearing
Big end bearing:
Type
Needle
bearing
Cra nkshaft:
Crankshaft assembly
width
(A)
174
±
0.1 mm
(6.85
±
0.004
in)
(F)
+
0
56
-0,05
+
0
mm
(2.205
-0.002
in)
Crankshaft
deflection
(D)
0.03
mm
(0-1)
0
.04
mm
(0-2)
0
.04
mm (0-3) 0.05
mm (0-4)
-5-

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