1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 132Get this manual
SUB-TRANSMISSION
Measure the 1.0of the shift forksSERVICE LIMIT10.05 mm (0.396 in) Measure the .0 of the shift fork shaftSERVICE LIMIT: 9.95 mm (0.392 in)
SUB SHIFT DRUM INSPECTION
Check the shih fork for damage or excessive worn
10LEA GEAA BUSHING