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Yamaha Manuals
Motorcycle
SZR 660
Service manual
Camshaft Chain Guide; Cylinder And Piston - Yamaha SZR 660 Service Manual
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Table Of Contents
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Contents
Table of Contents
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Enlarged version
INSPECTION
AND
REPAIR
ENG
\m
2.
Inspect:
•
Sprocket
Wear/Damage
-4
Rei
and
sprocket.
(1)
1/4
tooth
(maximum)
(2)
New
sprocket
tooth
profile
(3)
Roller
(4)
Sprocket
Replace
timing
chain
CAMSHAFT
CHAIN GUIDE
1
,
Inspect:
Lateral
chain guide (exhaust)
(1)
•
Lateral
chain guide
(intake)
(2)
Wear/Damage
-»
Replace.
CYLINDER
AND
PISTON
1.
Eliminate:
•
Carbon
deposits
(from the
piston
crow and
ring
grooves)
2.
Inspect:
•
Piston
wall
Wear/Scratches/Damage
-»
Replace.
3.
Eliminate:
•
Score marks and
Jacquer deposits
(from the side
of
the
piston)
Use
a
600
-
800
grit
wet
sandpaper.
NOTE:
--
Sand
in
a
crisscross
pattern.
Do
not
sand
exces-
sively.
4.
Inspect:
•
Cylinder water
jacket
Crust
of
minerals/Rust
-»
Remove.
•
Cylinder
wall
Wear/Scratches
~>
Rebore
or
replace.
5.
Measure:
•
Piston-to-cyiinder
clearance
INSPECTION
AND
REPAIR
ENG
%m
Measurement
stages:
First
stage""]
•
Measure
cylinder
bore
"C" with a
cylindergauge.
(1)
50
mm
from top
of cylinder
NOTE:
Measure
bore
parallel
and
at right
angles
to
the
driving shaft.
Then
calculate
average measure-
ment
m
Standard
Wear
limit
Cylinder
bore
H
C"
100.005
-100.045
mm
100.1
mm
r
X
+
Y
If
the
measurements
are
out
of
tolerance,
re-
place
the cylinder
liner,
piston
and
circlips
all
together.
Second
stage
[
•
Measure
diameter
"P*
of
the piston
skirt
with
a
micrometer.
(1
)
2.5
mm
from
the lower
edge
of
the piston
Piston
skirt
M
P"
size:
Standard
99.945 - 99.985
mm
If
the
measurements
are out
of tolerance,
re-
place the
piston
and
circlips
all
together.
4-37
4-38
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