Suzuki FU150SC Manual page 18

2-21 PERIODIC MAINTENANCE
OIL PRESSURE CHECK
OIL PRESSURE SPECIFICATION
LOW OIL PRESSURE
* Clogged oil filter
* Defective oil pump
* Combination of above items
HIGH OIL PRESSURE
PERIODIC MAINTENANCE 2-22
COMPRESSION PRESSURE CHECK
The compression of a cylinder is a good indicator of its internal condition.
The decision to change the cylinder with piston set is often based on the results of compression test.
Periodic maintenance records kept at your dealership should include compression readings for each
maintenance service.
COMPRESSION PRESSURE SPECIFICATION
4 15.0 kg/cm?
Low compression pressure can indicate any of the following conditions :
e Excessively worn cylinder wall
e Worn-down piston or piston rings
e 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 nuts 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 fully-charged condition.
Remove the parts concerned and test the compression
pressure in the following manner.
e Support the motorcycle with the center stand.
e Remove the spark plug.
« Fit the compression gauge in the plug hole, while taking care
that the connection tight.
e Keep the throttle grip in full-open position.
e While cranking the engine a few seconds with the starter,
and record the maximum gauge reading as the compression
of that cylinder.
pam 09915-64510 : Compression gauge
09915-63310 : Adaptor