Yamaha YFM660FS, Supplementary Service Manual

Page: 228 / 478

4 - 15
ENG
ROCKER ARMS
●
Measure the outside diameter
b
of the
rocker arm shafts.
Out of specification
→
Replace.
●
Calculate the clearance by subtracting the
rocker arm shaft outside diameter from the
rocker arm inside diameter.
Clearance greater than 0.08 mm (0.003 in)
→
Replace the defective part(s).
*****************************************************
Rocker arm shaft outside
diameter:
11.976 ~ 11.991 mm
(0.4715 ~ 0.4721 in)
Rocker arm to shaft standard
clearance:
0.009 ~ 0.042 mm
(0.0004 ~ 0.0017 in)
INSTALLING THE ROCKER ARM
1.Apply:
●
Engine oil
(onto the rocker arm shafts)
2.Install:
●
Rocker arms
1
●
Rocker arm shafts
2
NOTE:
●
The thread hole
a
of the rocker arm shaft
must face to the outside.
●
After installation, make sure that the thread
hole
a
of the rocker arm shaft is positioned
correctly, as shown in the illustration.