Cylinder Compression Test; Cylinder Head Cover - Honda CBR650RA Shop Manual

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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 3-6).
Install a compression gauge [1] into the spark plug hole.
Turn the ignition switch ON with the engine stop switch
" ".
Shift the transmission into neutral.
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:
1,491 kPa (15.2 kgf/cm
Low compression can be caused by:
– Blown cylinder head gasket
– Improper valve clearance 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/INSTALLATION
• The cylinder head cover can be serviced with the
engine installed in the frame.
Disconnect the spark plug caps from the spark plugs
(page 3-6).
Remove the following:
– Throttle body (page 7-13)
– PAIR control solenoid valve assembly (page 7-20)
Remove the bolt [1] and right middle cowl stay [2].
CBR650RA:
Disconnect the crankcase breather hose [1] from the
cylinder head cover.
Pull off the heat guard rubber [2] from the PAIR check
valve cover joints [3].
10-4
2 , 216 psi) at 300 min -1 (rpm)
[1]
CBR650RA:
[2]
[3]
[1]
[1]
[2]