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7-2 Precautions in Operation
General Information
Ÿ
Both cylinder and piston service cannot be carried out when engine mounted on frame.
Specification of CYLINDER
Item
Standard
Limit
ID
70.995~71.015
71.100
Cylinder
Bend
-
0.050
Top ring
0.015~0.050
0.090
Clearance between piston
rings
2
nd
ring
0.015~0.050
0.090
Top ring
0.150~0.300
0.500
2
nd
ring
0.300~0.450
0.650
Ring-end gap
Oil ring side rail
0.200~0.700
-
OD of piston (2
nd
)
70.430~70.480
70.380
Clearance between piston and cylinder
0.010~0.040
0.100
Piston/
Piston ring
ID of piston pin boss
17.002~17.008
16.970
OD of piston pin
16.994~17.000
16.960
Clearance between piston and piston pin
0.002~0.014
0.020
ID of connecting rod small-end
17.016~17.034
17.064
7-3 Trouble Diagnosis
Low or Unstable Compression Pressure
Ÿ
Cylinder or piston ring worn out
Knock or Noise
Ÿ
Cylinder or piston ring worn out
Ÿ
Carbon deposits on cylinder head top-side
Ÿ
Piston pin hole and piston pin wear out
Smoking in Exhaust Pipe
Ÿ
Piston or piston ring worn out
Ÿ
Piston ring installation improperly
Ÿ
Cylinder or piston damage
Engine Overheat
Ÿ
Carbon deposits on cylinder head top side
Ÿ
Cooling pipe clogged or not enough in
coolant flow
Summary of Contents for ET-250
Page 1: ...1 ET 250...
Page 51: ...Use 32 cutter to cut a quarter upper parts out...
Page 54: ......
Page 60: ...7 1 Mechanism Diagram 0 8 1 2kgf m 1 0 1 4kgf m...
Page 67: ...7 7 Cylinder Installation Install dowel pins and new gasket Dowel pins...
Page 96: ...10 1 Mechanism Diagram 5 0 6 0kgf m 1 0 1 4kgf m 0 8 1 2kgf m...
Page 140: ...REAR BRAKE...
Page 158: ......
Page 159: ...17 8 WIRING DIAGRAM...