Suzuki LT-R450K6 Instruction Manual page 46

2-34 PERlOOlC 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 should include compression readings lor each maintenance service.
Compresslon pressure:
Standard: 800 kPa (8.0 kgf/cm2,114 psi)
(Automatic decompression actuated)
Low compression pressure can indicate any of the following conditions:
Excessively worn cylinder wails
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
r
NOTE:
'Before testing the eng~ne for compression pressure, make
'
sure that the cylinder head nuts are tightened to the specified
p .
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 and fuel tank lower cover. ( D 5 - 4 )
* Remove the spark plug. ( W 2 - 1 0 )
Disconnect the fuel pump lead wire coupler
(3.
Install the compression gauge and adaptor in the spark plug
s.w3
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.
09915-64512: Compression gauge set
0991 3-10750: Adaptor