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2-22 PERIODIC MAINTENANCE
Overhaul the engine in the following cases:
* Compression pressure in one of the cylinders is less than 900
kPa (9 kgf/cm
2
, 128 psi).
* The difference in compression pressure between any two cyl-
inders is more than 200 kPa (2 kgf/cm
2
, 28 psi).
* All compression pressure readings are below 1 100 kPa (11
kgf/cm
2
, 156 psi) even when they measure more than 900 kPa
(9 kgf/cm
2
, 128 psi).
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.
* Have the engine warmed up before testing.
* Make sure that the battery is fully-charged.
Remove the related parts and test the compression pressure in
the following manner.
Remove the fuel tank. (!5-3)
Remove all the spark plugs. (!2-4)
Install the compression gauge and adaptor in the spark plug
hole. Make sure that the connection is tight.
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 com-
pression.
Repeat this procedure with the other cylinders.
( 09915-64510: Compression gauge set
09915-63210: Adaptor
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 should include compression readings for each maintenance service.
COMPRESSION PRESSURE SPECIFICATION
Standard Limit Difference
1 300 1 700 kPa 1 100 kPa 200kPa
13 17 kgf/cm
2
11 kgf/cm
2
2 kgf/cm
2
185 242 psi 156 psi 28 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
22


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