Compression Pressure Check; Compression Test Procedure - Suzuki LT-Z250 Service Manual

2-24 PERIODIC MAINTENANCE

COMPRESSION PRESSURE CHECK

The compression pressure reading 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 mainte-
nance records kept at your dealership shoud include compression readings for each maintenance service.
% Compression pressure:
Standard: 1 400 kPa (14.0 kgf/cm† , 199 psi)
Service Limit: 1 200 kPa (12.0 kgf/cm† , 171 psi)
Low compression pressure can indicate any of the following conditions:
* Excessively worn cylinder walls
* Worn piston or piston rings
* Piston rings stuck in grooves
* Poor valve seating
* Ruptured or otherwise defective cylinder head gasket
NOTE:
When the compression pressure goes below specification, check the engine for conditions listed above.

COMPRESSION TEST PROCEDURE

NOTE:
* Before testing the engine for compression pressure, make
sure that the cylinder head nuts are tightened to the specified
torque values and the valves are properly adjusted.
* Warm up the engine before testing.
* Make sure that the battery is fully charged.
Test the compression pressure in the following manner:
Remove the spark plug. (!2-7)
Install the compression gauge and adaptor in the spark plug
hole. Make sure that the connection is tight.
Keep the throttle lever in the fully open position.
Press the starter button and crank the engine for a few sec-
onds. Record the maximum gauge reading as the cylinder
compression.
$ 09915-64510: Compression gauge set
09918-02410: Adaptor or
09918-03810: Adaptor