CYLINDER HEADIVALVES
CYLINDER COMPRESSION
Warm
up
the
engine
to
normal
operating
tempera-
ture.
Stop the engine and remove
the
spark
plug
(page
3-
81.
Install a
comp
ression gauge.
Shift the transmission in neutral and open the choke
lever.
Open
the
throttle
all
the
way
and
crank
the
engine
with
the
kickstarter
untit
the
gauge
reading
stops
rising.
COMPRESSION
PRES
S
URE
:
981
- 1.177 kPa (
10
.0 - 12.0
kgf
/
cm
2
,
142 -
171
psi)
Low compression can be caused by:
- Blown cylinder head gasket
-
Improper
valve adjustment
Valve leakage
-
Worn
piston ring
or
cylinder
High compression can be caused by:
- Carbon
deposits
in
combustion
chamber
or
on
piston head
CAMSHAFT REMOVAL
Drain the engine oil (page 3-11)
Remove the
following:
- Valve adjuster hole caps (page 3-9)
-
left
crankcase cover (page
10
-4)
Sealing
bolt,
tensioner
spring
and
tensioner
push
rod
to
loosen
the
cam
chain
tensioner
(page 10-6)
Disconnect the spark pl
ug
cap.
Loosen
the
cylin
der
head side cover 6
mm
bolt.
Tap
the
head
of
the
6
mm
bolt
and
release
the
cylin-
der
head left side
cover
from
the
cylinder
head.
Remove
the
6
mm
bolt
, sealing
washer
and
cylinder
head left side cover.
Turn
the
crankshaft
counterclockwise,
and
align
the
. o ·
mark
on
the
cam
sprocket
with
the
index
notch
on
the
cylinder
head.
Secure the cam Remove
the
bolts,
cam
sprocket
and
dowel
pin.
c/lam wah a
plfJCe
of
WIre
to prevent It
from falling Into the
"""''''''
7-6
DOWEL PIN
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