kymco mo x500 Manual Do Serviço
8. CYLINDER HEAD/VALVES
8-4
XCITING 500
CYLINDER COMPRESSION TEST
Warm up the engine to normal operating
temperature.
Stop the engine and remove the spark plug
cap and remove the spark plug (page 3-7).
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 4 –
The maximum reading is usually reached 4 –
7 seconds.
Compression pressure:
13 kg/cm
2
(185 psi, 1300 kPa)
Low compression can be caused by:
Blown cylinder head gasket
Improper valve adjustment
Valve leakage
Worn piston ring or cylinder
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
Carbon deposits in combustion chamber or
on piston head
Park Plug Cap
Compression Gauge
To avoid discharging the battery, do not
operate the starter motor for more than
seven seconds.
*