Yamaha 2002 TDM900 Service Manual page 116

CHECKING THE SPARK PLUGS
EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Disconnect:
S spark plug cap
2. Remove:
S spark plug
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.
3. Check:
S spark plug type
Incorrect ! Replace.
4. 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.
5. Clean:
S spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
S spark plug gap a
(with a wire Thickness gauge)
Out of specification ! Regap.
7. Install:
S spark plug
NOTE:
Before installing the spark plug, clean the spark
plug and gasket surface.
3-27
CHK
ADJ
Spark plug type (manufacturer)
DPR8EA-9 (NGK)
X24EPR-U9 (DENSO)
Spark plug gap
0.8 X 0.9 mm
18 Nm (1.8 mSkg)