KEEWAY RKV125 Instruction And Maintenance Manual page 153

Allowable limit: 9.96mm.
Measure shift fork hole ID.
Allowable limit: 10.05mm.
Measure shift fork thickness.
Allowable limit: 4.6mm.
Measure OD of gearshift drum
Allowable limit: 39.75mm.
Measure the width of gearshift drum lock groove.
Allowable limit: 6.35mm.
Micrometer
Tester
Vernier caliper
Lock groove width