Yamaha TT-R125 Manuel D'atelier Du Proprietaire page 62

STARTING AND BREAK-IN
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" section in the
CHAPTER 3 and if there is any problem,
stop the engine immediately and check.
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GEN
INFO