Yamaha TT-R125(R) Owner's Service Manual page 58

STARTING AND BREAK-IN
BREAK-IN
Break-in is important to better fit the moving
and sliding parts as well as the installed parts.
It is also important to accustom the rider to the
machine better.
Avoid full-throttle run on a new machine for the
first 5 hours.
After the trial run, check for loose parts, oil
leakage and other problems.
Make full inspection and adjustment especially
of slack cables and drive chain and loose
spokes.
CAUTION:
After the break-in or before each ride, you
must check the entire machine for loose fit-
tings and fasteners as per "TORQUE-
CHECK POINTS".
Tighten all such fasteners as required.
BREAKING IN AFTER REPLACEMENT
After a part is replaced with a new one, it is
necessary to break it in as in a new machine.
This is required especially when the following
engine-related parts are replaced.
Cylinder
G
Piston
G
Piston ring
G
Valve
G
Camshaft
G
Crankshaft
G
Clutch
G
Transmission gear
G
Shift fork
G
* For warming up and inspection during
break-in, refer to "GENERAL INSPECTION
AND MAINTENANCE" and if there is any
problem, stop the engine immediately and
check.
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