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ELEC
IGNITION SYSTEM
EAS00737
TROUBLESHOOTING
Check:
1. main and ignition fuses
2. battery
3. spark plugs
4. ignition spark gap
5. ignition coil resistance
6. crankshaft position sensor resistance
7. main switch
8. engine stop switch
9. neutral switch
10.sidestand switch
11.starting circuit cut-off relay
12.wiring connections
(of the entire ignition system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. air filter case
4. bottom cowling
5. right side cowling
• Troubleshoot with the following special
tool(s).
EAS00738
EAS00739
EAS00741
The ignition system fails to operate (no
spark or intermittent spark).
Dynamic spark tester
YM-34487
Pocket tester
YM-03112
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?
YES
NO
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?
YES
NO
• Clean the battery
terminals.
• Recharge or
replace the bat-
tery.
3. Spark plugs
The following procedure applies to all of the
spark plugs.
• Check the condition of the spark plug.
• Check the spark plug type.
• Measure the spark plug gap.
Refer to “CHECKING THE SPARK
PLUGS” in chapter 3.
Standard spark plug
CR9EIA 9 (NGK)
IU27D (DENSO)
Spark plug gap
0.8 ~ 0.9 mm (0.032 ~ 0.035 in)
• Is the spark plug in good condition, is it of
the correct type, and is its gap within spec-
ification?
YES
NO
Re-gap or replace
the spark plug.