Yamaha YZF-R1S Service Manual - Chk
3-24
CHECKING THE SPARK PLUGS/
MEASURING THE COMPRESSION PRESSURE
CHK
ADJ
13 Nm (1.3 m
Skg, 9.4 ftSlb)
NOTE:
NOTE:
CAUTION:
8. Install:
Sspark plugs
Signition coils
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Install:
Sradiator upper bolts
Sradiator lower bolt
Refer to “RADIATOR” in chapter 6.
10. Install:
Sside cowlings
Sbottom cowlings
Refer to “COWLINGS”.
EAS00065
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of the cyl-
inders.
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
Svalve 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:
Signition coils
Sspark plugs
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.