Yamaha FZ6-ST Supplementary Service Manual page 414

EAS00737
TROUBLESHOOTING
The ignition system fails to operate (no
spark or intermittent spark).
Check:
1. main and ignition fuses
2. battery
3. spark plugs
4. ignition spark gap
5. spark plug cap resistance
6. ignition coil resistance
7. crankshaft position sensor
8. main switch
9. engine stop switch
10. neutral switch
11. sidestand switch
12. clutch switch
13. starting circuit cut-off relay (diode)
14. lean angle cut-off switch
15. wiring connections
(of the entire ignition system)
NOTE:
S Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. side cowlings
S Troubleshoot with the following special tool(s).
Dynamic spark tester
YM-34487
Ignition checker
90890-06754
Pocket tester
90890-03112, YU-3112
EAS00738
1. Main and ignition fuses
S Check the main and ignition fuses for conti-
nuity.
Refer to "CHECKING THE FUSES" in chap-
ter 3.
S Are the main and ignition fuses OK?
YES
NO
Replace the fuse(s).
8-9
IGNITION SYSTEM
EAS00739
2. Battery
S 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)
S Is the battery OK?
YES
EAS00741
3. Spark plugs
The following procedure applies to all of the
spark plugs.
S Check the condition of the spark plug.
S Check the spark plug type.
S Measure the spark plug gap.
Refer to "CHECKING THE SPARK PLUGS"
in chapter 3.
Standard spark plug
CR9EK (NGK)
Spark plug gap
0.6 X 0.7 mm (0.0236 X 0.0276 in)
S Is the spark plug in good condition, is it of the
correct type, and is its gap within specifica-
tion?
YES
ELEC
NO
S Clean the battery
terminals.
S Recharge or re-
place the battery.
NO
Re-gap or replace
the spark plug.