Checking The Spark Plugs - Yamaha YZF-R1S Service Manual

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CHECKING THE SPARK PLUGS

EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Remove:
S side cowlings
S bottom cowlings
Refer to "COWLINGS".
2. Remove:
S radiator upper bolts
S radiator lower bolt
Refer to "RADIATOR" in chapter 6.
3. Remove:
S ignition coils
S spark plugs
CAUTION:
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:
S spark plug type
Incorrect ! Change.
5. Check:
S electrode 1
Damage/wear ! Replace the spark plug.
S insulator 2
Abnormal color ! Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
S spark plug
(with a spark plug cleaner or wire brush)
7. Measure:
S spark plug gap a
(with a wire Thickness gauge)
Out of specification ! Regap.
3-23
CHK
ADJ
Spark plug type (manufacturer)
CR9EK (NGK)
Spark plug gap
0.6 X 0.7 mm
(0.0236 X 0.0276 in)

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