Compression Pressure Check; Compression Test Procedure - Suzuki Burgman UH125 Service Manual

COMPRESSION PRESSURE CHECK

The compression of a cylinder is a good indicator of its internal
condition.
The decision to overhaul the cylinder is often based on the
results of a compression test. Periodic maintenance records
kept at your dealership should include compression readings for
each maintenance service.
COMPRESSION PRESSURE SPECIFICATION
Standard
1 650 kPa
(16.5 kgf/cm 2 )
Low compression pressure can indicate any of the
following conditions:
* Excessively worn cylinder wall
* Worn-down piston or piston rings
* Piston rings stuck in grooves
* Poor seating of valves
* Ruptured or otherwise defective cylinder head gasket

COMPRESSION TEST PROCEDURE

NOTE:
* Before testing the engine for compression pressure, make
sure that the cylinder head bolts are tightened to the specified
torque values and valves are properly adjusted.
* Have the engine warmed up by idling before testing.
* Be sure that the battery used is in fully-charged condition.
Remove the parts concerned and test the compression pressure
in the following manner.
• Support the motorcycle with the center stand.
• Remove the front frame cover. ("8-8)
• Remove the spark plug. ("2-7)
• Install the compression gauge to the plug hole. Make sure
that the connection is tight.
% 09915-63311: Adaptor
09915-64512: Compression gauge
• Keep the throttle grip in the fully opened position.
• Press the starter button and crank the engine for a few sec-
onds. Record the maximum gauge reading as the cylinder
compression.
Limit
1 500 kPa
(15.0 kgf/cm 2 )
PERIODIC MAINTENANCE 2-23