Cylinder Compression; Cylinder Head Cover Removal - Honda VT750C2 Shadow Spirit Service Manual

CYLINDER HEAD/VALVE
CYLINDER COMPRESSION
To measure the
cylinder
compression of
each cylinder,
remove only one
plug at a time.
To avoid discharging
the battery, do not
operate the starter
motor for more
than seven
seconds.
NOTE:
If the engine must be running to do some work,
make sure the area is well-ventilated. l\Iever run the
engine in an enclosed area.
Warm up the engine to normal operating tempera­
ture.
Stop the engine, disconnect the spark plug caps and
remove one spark plug at a time.
Shift the transmission into neutral.
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.
Compression pressure:
1,373
±
98 kPa (14.0
±
1.0 kgf/cm
2
,
199
±
14 psi)
at 400
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
FRONT
Remove the fuel tank (page 3-4).
Disconnect the spark plug cap.
Remove the bolts and front right over head cover.
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