CYLINDER HEAD/VALVES
8-6
CYLINDER COMPRESSION TEST
Warm the engine to normal operating temperature.
Stop the engine and remove the all spark plug caps
and spark plugs (page 3-8).
Lift and support the fuel tank (page 3-5).
Disconnect the fuel pump unit 2P (Black) connector.
Install a compression gauge into the spark plug
hole.
Open the throttle all the way and crank the engine
with the starter motor until the gauge reading stops
rising.
The maximum reading is usually reached within 4 –
7 seconds.
Low compression can be caused by:
– Blown cylinder head gasket
– Improper valve adjustment
– Valve leakage
– Worn piston rings or cylinder
High compression can be caused by:
– Carbon deposits in combustion chamber or on
piston head
CYLINDER HEAD COVER REMOVAL
Remove the fuel tank (page 5-59).
Disconnect the spark plug caps.
Disconnect the PAIR air suction hoses from the cyl-
inder head cover.
TOOL:
Compression gauge
attachment
07RMJ-MY50100 or
equivalent commer-
cially available
Compression pressure:
1,304 kPa (13.3 kgf/cm
2
, 189 psi) at 350 min
-1
(rpm)
PAIR AIR SUCTION HOSES
SPARK PLUG CAPS
Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys.
email: info@motomatrix.co.uk
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