Yamaha XVS650 Service Manual page 74

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SPARK PLUG INSPECTION/IGNITION TIMING CHECK
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2.Check:
• Spark plug type
Incorrect ~ Replace.
Standard spark plug:
DPR1EA-9 (NGK)
X22EPR-U9 (DENSO)
3.1nspect:
• Electrode
CD
Wear/damage ~ Replace.
• Insulator
CV
Abnormal color
-7
Replace.
Normal color is a medium-to-Iight tan
color.
37HYXJ
377·000
4.Clean:
• Spark plug
(with spark plug cleaner or wire brush)
5.Measure:
• Spark plug gap
®
(with a wire gauge)
Out of specification
~
Adjust gap.
Spark plug gap:
0.8 - 0.9 mm (0.031 - 0.035 in)
6.1nstall:
• Spark plug
~18
Nm (1.8 m· kg, 13 ft ·Ib)
NOTE: _
Before installing a spark plug, clean the
gasket surface and the plug surface.
EB3030S1
IGNITION TIMING CHECK
NOTE: _
Prior to checking the ignition timing, check
all electrical connections related to the igni-
tion system. Make sure all connections are
tight and free of corrosion and that all
ground connections are tight.
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