Honda CBR125R Owner's Manual page 275

Check the gears for freedom of movement or rota-
tion on each shaft.
Apply engine oil to the transmission gear teeth.
Engage the mainshaft assembly and countershaft
assembly.
Install the mainshaft assembly and countershaft
Be sure to install
assembly together into the right crankcase.
the three end
washers
(mainshaft; left
only/countershaft;
both ends).
Each shift fork has an identification marks, "R" is for
the right shift fork, "L" is the left shift fork and "C" is
for the center shift fork.
Install the shift forks into the shifter gear grooves
with the marks facing up (left crankcase side).
Apply molybdenum oil solution to the shift drum
journal outer surface and install it, while aligning
the shift fork guide pins with the guide grooves.
CRANKSHAFT/BALANCER/TRANSMISSION
: Each gear teeth
COUNTERSHAFT ASSEMBLY
MAINSHAFT
ASSEMBLY
"L" MARK
MAINSHAFT
ASSEMBLY
COUNTERSHAFT
ASSEMBLY
"C" MARK
"R" MARK
SHIFT FORKS
SHIFT DRUM
12-17