Yamaha TTR125LM, Owner'S Service Manual

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ENG
CAMSHAFT AND ROCKER ARMS
Rocker arms and rocker arm shafts
1. Inspect:
●
Cam lobe contact surface
a
●
Adjuster surface 1
Wear/pitting/scratches/blue discolora-
tion
→
Replace.
Measurement steps:
●
Measure the inside diameter
a
of the
rocker arm holes.
Out of specification
→
Replace.
Inside diameter (rocker arm):
10.000 ~ 10.015 mm
(0.3937 ~ 0.3943 in)
<Limit>: 10.03 mm (0.3949 in)
●
Measure the outside diameter
b
of the
rocker arm shafts.
Out of specification
→
Replace.
Outside diameter
(rocker arm shaft):
9.981 ~ 9.991 mm
(0.3930 ~ 0.3933 in)
<Limit>: 9.95 mm (0.3917 in)
ASSEMBLY AND INSTALLATION
1. Apply:
●
Molybdenum disulfide oil
(onto the camshaft cam lobe and rocker
arm hole)
●
Engine oil
(onto the camshaft bearing)
2. Install:
●
Rocker arms
●
Camshaft
1
3. Apply:
●
Engine oil
(onto the rocker arm shaft)
4. Install:
●
Rocker arm shaft