Compression Pressure Check; Compression Test Procedure - Suzuki GSX-R1000 Service Manual

PERIODIC MAINTENANCE 2-33
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
1300 -1700 kPa
1000 kPa 200 kPa
C
3 - 17 k gf/Cm 2
)
( 10 k gf/Cm
2
)
(2 k gf/Cm
2
)
185 - 242 psi 148 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
Overhaul the engine in the following cases:
*
Compression pressure in one of the cylinders is 1 000 kPa
(10 kgf/cm
2 , 148 psi) and less.
*
The difference in compression pressure between any two cyl-
inders is 200 kPa (2 kgf/cm 2
,
28 psi) and more.
*
All compression pressure readings are below 1 300 kPa (13
kgf/cm 2 , 185 psi) even when they measure 1 000 kPa (10
kgf/cm 2 , 148 psi) and more.
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.
• Lift and support the fuel tank. (c::::T'5-5)
• Remove all the spark plugs. (c::::T'2-6)
• 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
compression.
• Repeat this procedure with the other cylinders.
,roOt!
09915·64512: Compression gauge set
09913·10750: Adaptor