Specifications - Yamaha ET250D Supplementary Service Manual

1980 ET250D
3. SPECIFICATIONS
General
NOTE:
* ...
New specification
(Compa red with 1979 ET250C)
Model:
Model (I.B.M.
No) *
ET250D (8J5)
Frame 1.0. and starting number
*
8J5-038101
Engine 1.0. and starting number *
S246-0381 01
Dimension:
Overall length
2 .385 mm (93.9 in)
Overall width (std) 905 mm (35.6 in)
Overall height (w/ windshield)
965 mm (38.0 in)
Engine
Description:
Engine type
Fan cooled. two stroke 5-port. single cylinder
Engine model S246
Displacement
246 cm
3
(15 cu .in)
Bore X stroke
73 X 59 mm (2.87 X 2 .3 in)
Effective compression ratio
6.6: 1
Starti ng system Recoi l hand starter
Ignition system C.D.1.
Lubrication system
"Autolube" oil injection
Cylinder head
Combustion chamber volume (with spark plug) 29.6cc(1.81 cu.in)
Compression chamber type Dome
+
squish
Head gasket thickness 0.5 mm (0.02 in)
Cylinder:
Material Cast iron sleeves alu minum cylinder
Bore size 73 mm (2.87 in)
Taper limit 0.05 mm (0.0020 in)
Out of round limit 0.01 mm (0.0004 in)
Piston:
Piston skirt clearance
0.045 ~ 0.050 mm (0.00 18 ~ 0 .0020 in)
(Measuring point) (10 mm from pi ston skirt end)
Piston over size 1 st 73 .25 mm (2.88 in)
2nd 73.50 mm (2.89 in)
3rd 73.75 mm (2 .90 in)
4th 74.00 mm (2 .91 in)
Piston pin outside diameter X length 18 X 55 mm (0.71 X 2.17 in)
Piston ring:
Piston ring design (Top) Keystone
Piston ring design (2nd) Keystone
Ring end gap (Installed) (Top) 0.3
~
0 .5 mm (0.012
~
0.020 in)
Ring end gap (Installed) (2nd)
0.3
~
0.5 mm (0.012
~
0.020 in)
Small end bearing:
Type Needle bearing
Big end bearing:
Type Needle bearing
Crankshaft:
Crankshaft assembly width (A)
+0 + 0 .
56 _
0.05
mm (2.2 _
0.002 In)
Crankshaft deflection (D) 0.02 mm (0 .0008 in)
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