Honda CBR125R Owner's Manual page 281

Install the left crankcase bolts and clamps and
tighten the bolts in a crisscross pattern in 2 or 3
steps.
Install the spring, washer and suitable 3 mm screw
to the bearing push plug, then install them into the
left crankcase.
Install the snap ring and remove the screw.
Make sure the snap
ring is firmly seated
in the groove.
Install the cam chain through the crankcase.
Install the cam chain over the timing sprocket.
Install the cam chain tensioner and tensioner guide
plate.
Install and tighten the tensioner guide plate bolt.
Install the removed parts (page 12-3) in the reverse
order of removal.
CRANKSHAFT/BALANCER/TRANSMISSION
BOLTS
3 mm SCREW
WASHER
PUSH PLUG
CAM CHAIN TENSIONER
CAM CHAIN
BOLTS/CLAMPS
SNAP RING
SPRING
PLATE
BOLT
12-23