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09915-64510 : Compression gauge
09915-63210 : Adapter
①
②
10-14 kgf/cm
2
8 kgf/cm
2
2
1
COMPRESSION PRESSURE
INSPECTION
NOTE:
Before testing the compression pressure of the engine, be sure that the nuts and bolts of the cylinder head
are securely tightened to the specified torque, and the valve clearance is correct.
Keep the engine running idle for several minutes before carrying-out the test.
Remove the spark plug.
Fit the compression gauge
and adapter
to
the plug hole, taking care to make the connec-
tion absolutely tight.
Twist the throttle grip into wide-open position.
Crank the engine several times with the starting
motor, and read the highest gauge indication as
the compression of the cylinder.
①
②
●
●
●
Compression pressure
Standard
Limit
A low compression pressure may indication any of
the following malfunctions:
* Excessively worn cylinder wall.
* Worn piston or piston rings.
* Piston rings stuck in the grooves.
* Poor seating contact of valves.
* Defective cylinder head gasket.
When the compression pressure noted is down to
or below the limit indication above, the engine
must be disassembled, inspected and repaired as
required.
PERIODIC MAINTENANCE
2 - 1 8
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