PERIODIC MAINTENANCE 2-27
COMPRESSION PRESSURE CHECK
The compression pressure reading of a
cy
linder
is
a good indicator of its internal condition.
The decision
to
overhaul the cylinder
is
often based
on
the resu
lt
s of a compression tes
t.
Periodic mai
nt
e-
nance records kept
at
your dealership should include compression readings for each maintenance service.
~
Compression
pressure
Standard: 950 kPa (9.5
kgflcm
',
135 psi)
(Automatic
decompression
actuated)
Low
compression
pressure
can
indicate
any
of
the
following
conditions:
*
Ex
cessively worn cylinder walls
* Worn piston or piston rings
* Piston rings stuck
in
grooves
* Poor
va
l
ve
seating
* Ruptured or otherwise defective cylinder head gasket
NOTE:
When the compression pressure goes below specification, check the engine for conditions list
ed
above.
COMPRESSION TEST PROCEDURE
NOTE
:
* Before testing the engine for compression pressure, make sure
that the cylinder
head
bolts are tightened to the specified
torque values and the valves are properly adjusted.
* Warm up the engine before testing.
* Make sure that the battery
is
fully charged.
Remove the related parts and test the compression pressure
in
the
fo
llowing manner.
• Remove the spark plug.
(r-r
2-9)
• I
ns
ta
ll
the compression gauge and adaptor
in
the spark plug
hole.
Make sure that the connection
is
tight.
•
Keep
the
thrott
le
grip
in
the
fully
opon
position.
• Press
th
e starter
bu
tt
on
and crank the engine for a few sec-
on
ds.
• Record the maximum gauge reading as the cylinder compres-
sion.
cmJ
09915-64510:
Compression
gauge set
09915-63310:
Adaptor
http://www.motorcycle.in.th
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