Yamaha YZF-R6 99 Service Manual page 85

MEASURING THE COMPRESSION PRESSURE
4. Remove:
S spark plug
CAUTION:
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug wells to prevent it
from falling into the cylinders.
5. Install:
S compression gauge 1
Compression gauge
90890-03081
Adapter
90890-04136
6. Measure:
S compression pressure
Out of specification ! Refer to steps (c) and
(d).
Compression pressure (at sea
level)
Minimum
1300 kPa (13.0 kg/cm
13.0 bar)
Standard
1550 kPa (15.5 kg/cm
15.5 bar)
Maximum
1600 kPa (16.0 kg/cm
16.0 bar)
a. Set the main switch to "ON".
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
WARNING
To prevent sparking, ground all spark plug
leads before cranking the engine.
NOTE:
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
2
kg/cm , 1 bar).
3-25
CHK
ADJ
2
,
2
,
2
,