Honda CBR125R Owner's Manual page 211

Install the inner and outer valve springs with the
tightly wound coils should face toward the combus-
tion chamber.
Install the spring retainer.
Grease the cotters
to ease installation.
Compress the valve spring using the special tools
To prevent loss of
and install the valve cotters.
tension, do not
compress the valve
TOOLS:
spring more than
Valve spring compressor
necessary.
Valve spring compressor
attachment
Tap the valve stems gently with two plastic hammer
Support the
to firmly seat the cotters.
cylinder head above
the work bench
surface to prevent
valve damage.
Install the throttle body insulator by aligning the
groove of the throttle body insulator with the tab of
the cylinder head.
Tighten the insulator band screw (page 5-57).
Install the following:
– Spark plug (page 3-10)
– O sensor (page 5-68)
2
VALVE SPRING COMPRESSOR
07757-0010000
07959-KM30101
CYLINDER HEAD/VALVES
INNER SPRING OUTER SPRING
Combustion chamber side
ATTACHMENT
BAND SCREW
COTTERS
INSULATOR
Align
8-23