Yamaha TT-R125(P) Owner's Service Manual page 242

CYLINDER HEAD
3. Install:
Timing chain
Camshaft sprocket
Installation steps:
Turn the crankshaft counterclockwise with
a wrench.
Align the "I" mark a on the rotor with the
stationary pointer b on the crankcase
cover.
Align the match mark c on the camshaft
sprocket with the stationary pointer d on
the cylinder head.
Fit the timing chain 1 onto camshaft
sprocket 2 and install the camshaft
sprocket on the camshaft.
NOTE:
When installing the camshaft sprocket, keep
the timing chain as tense as possible on the
exhaust side.
CAUTION:
Do not turn the crankshaft during instal-
lation of the camshaft. Damage or
improper valve timing will result.
Remove the safety wire from the timing
chain.
4. Install:
Washer
Bolt (camshaft sprocket)
NOTE:
Temporarily tighten the bolt (camshaft sprocket)
at this point.
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ENG