Measuring The Compression Pressure - Yamaha YZF-R1S Service Manual

CHECKING THE SPARK PLUGS/

MEASURING THE COMPRESSION PRESSURE

8. Install:
S spark plugs
S ignition coils
NOTE:
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Install:
S radiator upper bolts
S radiator lower bolt
Refer to "RADIATOR" in chapter 6.
10. Install:
S side cowlings
S bottom cowlings
Refer to "COWLINGS".
EAS00065
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of the cyl-
inders.
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
S valve clearance
Out of specification ! Adjust.
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE".
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
S ignition coils
S spark plugs
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.
3-24
CHK
ADJ
13 Nm (1.3 mSkg, 9.4 ftSlb)