Honda Shadow TA200 2001 Manual page 105

CYUNDERCOMPRESSIO'J
If the engine must be running
to
do
some workJ
make sure
the area is well-ventilated. Never run the engine in an en-
closed area.
Warm up the engine to normal operating temperature.
Stop the engine, disconnect the spark plug cap and remove
the spark plug.
Install the compression gauge attachment i n a spark plug hole.
Connect the compression gauge to the attachment.
Open the throttle all the way and crank the engine with the
starter motor.
NOTE:
Crank the engine until the gauge reading stops rising.
The maximum reading i s usually reached within 4 - 7
seconds.
STANDARD: 1,177 kPa (12.0 kgf/cm', 171 psi) at 450 mlrr'
(rpm)
If compression is high, i t i n dicates that carbon deposits have
accumulated on the combustion chamber and/or the piston
crown.
If compression is low, pour 3 - 5 cc (0.1 - 0.2 oz) of clean
engine oil i n to the cylinder through the spark plug hate and
recheck the compression.
If the compression increases from the previous value,
check the cylinder, piston and piston rings.
Leaking cylinder head gasket
Worn piston ring
Worn cylinder and piston
If the compression is the same as the previous value,
check the values for l e akage.
CYLINDER HEADNALVES
7-3