Precautions In Operation; Trouble Diagnosis - TGB BLADE 425 Service Manual

Precautions in Operation

General Information
Specification
ID
Cylinder
Bend
Clearance between piston
rings
Piston/
Ring-end gap
Piston ring
OD of piston (2
Clearance between piston and cylinder
ID of piston pin boss
OD of piston pin
Clearance between piston and piston pin
ID of connecting rod small-end

Trouble Diagnosis

Low or Unstable Compression Pressure
● Cylinder or piston ring worn out
Knock or Noise
● Cylinder or piston ring worn out
● Carbon deposits on cylinder head top-side
● Piston pin hole and piston pin wear out
7-2
7. CYLINDER/PISTON
T
7-1
Item
Top ring
nd
2 ring
Top ring
nd
2 ring
Oil ring side rail
nd
)
Standard
86.022~86.052
-
0.04~0.075
0.02~0.055
0.150~0.300
0.300~0.450
0.200~0.700
85.30~85.50
0.04~0.058
20.001~20.006
19.996~20.000
0.001~0.010
20.002~20.01
Smoking in Exhaust Pipe
● Piston or piston ring worn out
● Piston ring installation improperly
● Cylinder or piston damage
Engine Overheat
● Carbon deposits on cylinder head top side
● Cooling pipe clogged or not enough in coolant
flow
Unit：mm
Limit
86.100
0.050
0.011
0.090
0.500
0.650
-
85.25
0.120
20.020
19.960
0.020
20.040