1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 144Get this manual
TRANSMISSION CRANKSHAFT
Measure the gearshift ru .0 SERVICE LIMIT41 .8 mm 11 .65 inJ
Cairo late the shift fork to shift dru clearanceSERVICE LIMIT0.10 mm (0.004 in)
Measure the gearshi ft ru groove widthSERVICE LIMIT.4 mm (0.25 in)
Remove the ransmission gearsMeasure each gear's 1.0