YG125-30B Maintenance Manual
Crankcase, crankshaft and Shift mechanism
100
Crankshaft and balance shaft inspection
1.
Check whether the crankshaft journals are
abnormally worn, whether the connecting rod can
rotate flexibly and whether there is significant noise
while rotating.
Measure the connecting rod small end bore diameter.
Maintenance limit:
≤Ф
20.063mm.
2.
Measure the crankshaft radial run out.
Maintenance limit:
≤
0.10mm.
3.
Measure the connecting rod big end radial
clearance.
Maintenance limit:
≤
0.06mm.
4.
Measure the connecting rod large end side
clearance, the maintenance limit:
≤
0.80mm.
5.
Measure the left hand crank journal.
Maintenance limit:
≥Ф
29.87mm.
6.
Check whether the balance shaft supplementary
tooth spring fails and whether the balance shaft
supplementary tooth can return.
Variable transmission system
To remove the variable transmission system:
1.
Remove the (left hand) crankcase (See
“
Removal of
left hand crankcase").
2.
Remove the shift fork shaft.
Inside micrometer
105
80
Radial runout
Dial gauge
Suppo
r
Outside
Clearance gauge
Summary of Contents for YG125-30B
Page 99: ...YG125 30B Maintenance Manual Frame and exhaust system 106 10 Frame and exhaust system...
Page 130: ...YG125 30B Maintenance Manual Illumination signal system 136 Circuit schematic drawing...
Page 141: ...YG125 30B Maintenance Manual Engine management system 147 Circuit schematic drawing...
Page 151: ...YG125 30B Maintenance Manual Electrical System Diagram 157 19 Electrical System Diagram...
