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CYLINDER HEADIV ALVEI CAMSHAFT
CYLINDER COMPRESSION
Warm up the engine to
nor
mal operating tempera-
ture.
Stop
the
engine,
disconnect the spark plug
cap and
remove
the spark plug !page 3-9).
Install the
compression gauge into
the
spark plug
hole.
Shift
the transmission
in
neutral.
Open
the th
rottle all
the
way
and crank the
engine
with
the
starter motor
until the gauge reading
stops
rising. The maximum reading is usua lly reached
within
4·7
seconds.
COMPRESSION
PRESSURE:
608-902
kPa
(6.2-
9.2
kgf/
cm
2
,
88
-
131
ps i)
at 450
rpm
(min"
)
Check
that there
is
no leakage at the gauge
connec-
tion.
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
CYLINDER HEAD COVER REMOVAL/
DISASSEMBLY
REMOVAL
Remove the fuel tank
(page
5-21).
Release the radiator
upper
hose, SE
valve cable and
throttle cable.
Remove the fuel tank heat
guard.
Remove the
wire clamp
from the fuel tank heat
guard.
COM PRESSION GAUGE
Remove the four bolts and valve
adjusti
ng hole
~ii:ij;!';;::;;;;;;;;iiii~
caps.
8-6
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