Suzuki DR650SE - Compression Pressure Check

2·17 PERIODIC MAINTENANCE
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 main-
tenance service.
COMPRESSION PRESSURE SPECIFICATION
Standard
850 kPa
Approx. (8.5 k
g
/cm
2
)
120 psi
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 ful/y-charged condition.
Remove the parts concerned and test the compression pres-
sure in
the following manner.
• Remove the spark plug.
• Fit the compression gauge in the plug hole, while taking
care that the connection tight.
• Keep the throttle grip in full-open position.
• While cranking the engine a few seconds with the start-
er, and record the maximum gauge reading as the com-
pression of that cylinder.
a 09915-64510: Compression gauge
0991 5-6331 0: Adaptor