Installing The Camshaft And Rocker Arms - Yamaha MBK MW125 2014 Service Manual

1
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pit-
ting/scratches → Replace or check the lubri-
cation system.
3. Measure:
• Rocker arm inside diameter "a"
Out of specification → Replace.
Rocker arm inside diameter
9.985–10.000 mm (0.3931–
0.3937 in)
Limit
10.015 mm (0.3943 in)
a
4. Measure:
• Rocker arm shaft outside diameter "a"
Out of specification → Replace.
Rocker arm shaft outside diame-
ter
9.966–9.976 mm (0.3924–0.3928
in)
Limit
9.936 mm (0.3912 in)
1
5. Calculate:
• Rocker-arm-to-rocker-arm-shaft clearance
TIP
Calculate the clearance by subtracting the rock-
er arm shaft outside diameter from the rocker
arm inside diameter.
Out of specification → Replace the defective
part(s).
EAS30270
INSTALLING THE CAMSHAFT AND ROCKER
ARMS
1. Install:
• Bearing "1"
(onto the cylinder head)
TIP
Install the bearing so that the seal "a" is facing
the right side.
2. Lubricate:
• Camshaft
5-19
CAMSHAFT
Rocker-arm-to-rocker-arm-shaft
clearance
0.009–0.034 mm (0.0004–0.0013
in)
Limit
0.080 mm (0.0032 in)
Recommended lubricant
Camshaft
Molybdenum disulfide grease
Camshaft bearing
Engine oil
1
a