Yamaha YZF-R1S Service Manual - Chk
3-26
MEASURING THE COMPRESSION PRESSURE/
CHECKING THE ENGINE OIL LEVEL
CHK
ADJ
13 Nm (1.3 m
Skg, 9.4 ftSlb)
NOTE:
d. If the compression pressure is below the
minimum specification, pour a teaspoonful of
engine oil into the spark plug bore and mea-
sure again.
Refer to the following table.
Compression pressure
(with oil applied into the cylinder)
Reading
Diagnosis
Higher than
without oil
Piston ring(s) wear
or damage
!
Repair.
Same as without
oil
Piston, valves,
cylinder head
gasket or piston
possibly defective
! Repair.
6. Install:
Sspark plug
7. Install:
Signition coils
EAS00069
CHECKING THE ENGINE OIL LEVEL
1. Stand the motorcycle on a level surface.
SPlace the motorcycle on a suitable stand.
SMake sure the motorcycle is upright.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Check:
Sengine oil level
The engine oil level should be between the
minimum level mark
a
and maximum level
mark
b
.
Below the minimum level mark
! Add the
recommended engine oil to the proper level.