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CYLINDER HEAD/VALVES
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.
TOOL:
Compression gauge
attachment
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.
Compression pressure:
1,304 kPa (13.3 kgf/cm
Low compression can be caused by:
- Blown cylinder head gasket
-
-
- Worn piston rings or cylinder
High compression can be caused by:
-
CYLINDER HEAD COVER REMOVAL
Remove the fuel tank (page 5-58).
Disconnect the spark plug caps.
Disconnect the PAIR air suction hoses from the cyl
inder head cover.
-
8-6
07RMJ-MV50100 or
equivalent commer
cially available
2
, 189 psi) at 350 min•' (rpm)
Improper valve adjustment
Valve leakage
Carbon deposits
in
combustion chamber or on
piston head
2P (Black) CONNECTOR
-
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