Cylinder Compression; Cylinder Head Cover Removal - Honda CRF1000 Shop Manual

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CYLINDER HEAD/VALVE/CAMSHAFT

CYLINDER COMPRESSION

Warm up the engine to normal operating temperature.
Stop the engine, disconnect the spark plug caps and
remove the spark plugs (page 3-5).
Disconnect the fuel pump unit 3P (Black) connector
(page 7-4).
Install the compression gauge [1] into the spark plugs
hole.
Turn the ignition switch ON.
Shift the transmission into the neutral position.
CRF1000/A:
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:
1,245 kPa (12.7 kgf/cm
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
Remove the ignition coil tray (page 5-9).
Remove the bolts [1].
Remove the cylinder head cover [1] to the right side as
shown.
10-4
2 , 181 psi) at 500 rpm
[1]
[1]
[1]