Yamaha TT-R125(P) Owner's Service Manual page 344

CRANKCASE, CRANKSHAFT AND BALANCER
Crankshaft
1. Remove:
Crankshaft 1
Use the crankcase separating tool 2.
Crankcase separating tool:
YU-1135-A/90890-01135
CAUTION:
Do not use a hammer to drive out the
crankshaft.
Bearing
1. Remove:
Bearing 1
NOTE:
Remove the bearing from the crankcase by
pressing its inner race as shown in.
Do not use the removed bearing.
INSPECTION
Timing chain and timing chain guide
1. Inspect:
Timing chain
Cracks/stiff
and camshaft sprocket as a set.
2. Inspect:
Timing chain guide
Wear/damage
4 - 68
ENG
Replace the timing chain
Replace.