Yamaha YZF-R1S Service Manual - Chk
3-23
CHECKING THE SPARK PLUGS
CHK
ADJ
CAUTION:
EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Remove:
Sside cowlings
Sbottom cowlings
Refer to “COWLINGS”.
2. Remove:
Sradiator upper bolts
Sradiator lower bolt
Refer to “RADIATOR” in chapter 6.
3. Remove:
Signition coils
Sspark plugs
Before removing the spark plugs, blow away
any dirt accumulated in the spark plug wells
with compressed air to prevent it from fal-
ling into the cylinders.
4. Check:
Sspark plug type
Incorrect
! Change.
Spark plug type (manufacturer)
CR9EK (NGK)
5. Check:
Selectrode
1
Damage / wear
! Replace the spark plug.
Sinsulator
2
Abnormal color
! Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
Sspark plug
(with a spark plug cleaner or wire brush)
7. Measure:
Sspark plug gap
a
(with a wire Thickness gauge)
Out of specification
! Regap.
Spark plug gap
0.6
X 0.7 mm
(0.0236
X 0.0276 in)