Yamaha XT660 2004, Service Manual

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ELEC
IGNITION SYSTEM
EAS00736
TROUBLESHOOTING
Check:
1. main and ignition fuses
2. battery
3. spark plug
4. ignition spark gap
5. spark plug cap resistance
6. ignition coil resistance
7. crankshaft position sensor resistance
8. main switch
9. engine stop switch
10.lean angle cut-off switch
11.wiring connections (of the entire ignition
system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. seat
2. battery cover
3. side panels (left and right)
4. fuel tank side covers (left and right)
5. fuel tank
• Troubleshoot with the following special
tool(s).
EAS00738
YES NO
EAS00739
YES NO
EAS00740
YES
NO
The ignition system fails to operate (no
spark or intermittent spark).
Pocket tester
90890-03112
Ignition checker
90890-06754
1. Main and ignition fuses
• Check the main and ignition fuses for con-
tinuity.
Refer to “CHECKING THE FUSES” in
chapter 3.
• Are the main and ignition fuses OK?
Replace the fuse(s).
2. Battery
• Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
• Clean the battery
terminals.
• Recharge or
replace the battery.
3. Spark plug
• Check the condition of the spark plug.
• Check the spark plug type.
• Measure the spark plug gap.
Refer to “CHECKING THE SPARK PLUG”
in chapter 3.
Standard spark plug
CR7E (NGK)
Spark plug gap
0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
• Is the spark plug in good condition, is it of
the correct type, and is its gap within spec-
ification?
Re-gap or replace
the spark plug.