Yamaha YZF-R6, Service Manual

Page: 95 / 425

3-26
MEASURING THE COMPRESSION PRESSURE/
CHECKING THE ENGINE OIL LEVEL
CHK
ADJ
13 Nm (1.3 m kg)
NOTE:
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces, and piston crown for
carbon deposits.
Carbon deposits
Eliminate.
d. If the compression pressure is below the
minimum specification, squirt a few drops of
oil into the cylinder and measure again.
Refer to the following table.
Compression pressure
(with oil applied into the cylinder)
Reading Diagnosis
Higher than
without oil Piston wear or
damage
Repair.
Same as without
oil
Piston ring(-s),
valve(-s), cylinder
head gasket or
piston possibly
defective
Repair.
7. Install:
spark plug
EB303070
CHECKING THE ENGINE OIL LEVEL
1. Stand the motorcycle on a level surface.
Place the motorcycle on a suitable stand.
Make sure that the motorcycle is upright.
2. Start the engine, let it idle for several min-
utes, and then stop it.
3. Check:
engine 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.