Generic TR 125 Service Manual page 129

Set aside the shifting fork shaft.
Remove the gearshift drum.
Remove the gearshift fork.
Inspection
Measure the outer diameter of the shifting fork shaft.
Allowable limit: 9.96mm.
Measure the inner diameter of the shifting fork hole.
Allowable limit: 10.05mm.
Shifting fork
Shifting fork
shaft
Gearshift drum
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Microcalliper
Testing
gauge