Decompression; Rocker Arm And Rocker Arm Shaft - Yamaha SZR 660 Service Manual

INSPECTION
AND
REPAIR
NOTE:
Tighten
the bolts (cylinder
head
cover) in a criss-
cross pattern from innermost to outer.
Do
not turn the
camshaft when measuring
clearance with the Piastigauge' 1
*.
Remove
the cylinder head cover
and measure
width
of the Plastigauge^.
5.
Measure:
• Bearing diameter
(a)
(camshaft)
Out
of specification
**
Replace camshaft
Within
specification -» Replace
cylinder
head.
Bearing diameter
(camshaft):
22.967 -22.980
mm
DECOMPRESSION
1
Inspect:
•
Spring
(1)
Damage
-» Replace.
• Decompression
pin
(2)
•
Decompression
lever
(3)
• Decompression cams
(4)
Damage/Bends/Wear
-» Replace.
2.
Check:
• Decompression
play
Play
exists
-4 Replace.
INSPECTION
AND REPAIR
ROCKER ARM AND ROCKER ARM SHAFT
1.
Inspect:
• Rocker arm shaft
Blue colour/Grooves
-»
Replace
shaft
and
check
lubrication system.
2.
inspect:
•
Rocker arm
shaft slot
(1
•
Surface
in
contact with
cam
eccentric
(2)
• Adjuster surface
(3)
Pitting/Wear/Scratches/BJue colour-* Re-
place and check
lubrication
system.
3.
Measure:
• Rocker
arm-shaft clearance
Rocker arm-shaft clearance
=
Internal diameter
(a) of
rocker
arm
External
diameter
(b)
of shaft
Out
of specification
-
Replace assembly.
®
=Sp ~^
y
s
Rocker arm
shaft clearance:
0.009
~
0.042
mm
CAMSHAFT
CHAIN,
SPROCKET AND
CHAIN
GUIDE
1
.
Inspect:
• Chain
Stiffness/Cracks -> Replace timing chain
and
sprocket.
4-35 4-36