Yamaha XJR1300(L) 99, Service Manual

Page: 71 / 338

3-13
CHECKING THE SPARK PLUGS
CHECKING THE IGNITION TIMING
CHK
ADJ
CAUTION:
NOTE:
NOTE:
EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Disconnect:
spark plug cap
2. Remove:
spark plug
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.
3. Check:
spark plug type
Incorrect
Change.
Spark plug type (manufacturer)
DPR8EA-9 (NGK)
X24EPR-U9 (DENSO)
4. Check
electrode 1
Damage / wear Replace the spark plug.
insulator 2
Abnormal color Replace the spark plug.
Normal color is a medium-to-light tan color.
5. Clean:
spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
spark plug gap
a
(with a wire gauge)
Out of specification
Regap.
Spark plug gap
0.8 0.9 mm
7. Install:
spark plug
Spark plug
18 Nm (1.8 m kg)
Before installing the spark plug clean the spark
plug and gasket surface.
8. Connect:
spark plug cap
EAS00063
CHECKING THE IGNITION TIMING
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure that all connections are tight and free
of corrosion.
1. Remove:
timing plate cover 1