Page 220 - 2019 SHOP MANUAL CRF1000/A/D

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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.
CRF1000/A: Shift the transmission into the neutral position.
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 [1]
seconds.
COMPRESSION PRESSURE:
2
1,245 kPa (12.7 kgf/cm , 181 psi) at 500 rpm
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).
[1]
Remove the bolts [1].

Remove the cylinder head cover [1] to the right side as
shown. [1]

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