Yamaha 5KR2, Service Manual

Page: 286 / 332

7-9
IGNITION SYSTEM
ELEC
2. Battery
D
Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
Min. open-circuit voltage
12.8 V or more at 20
_
C
D
Is the battery OK?
YES NO
3. Spark plugs
The following procedure applies to all of the
spark plugs.
D
Check the condition of the spark plug.
D
Check the spark plug type.
D
Measure the spark plug gap.
Refer to “CHECKING THE SPARK PLUGS”
in chapter 3.
Standard spark plug
Spark plug gap
0.6
X
0.7 mm
D
Is the spark plug in good condition, is it of the
correct type, and its gap within specifica-
tion?
YES
Re-gap or replace
the spark plug.
NO
D
Clean the battery
terminals.
D
Recharge or re-
place the battery.
EAS00741
NOTE:
YES NO
Replace the fuse(-s).
1. Main and ignition fuses
D
Check the main and ignition fuses for conti-
nuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.
D
Are the main and ignition fuses OK?
EAS00737 EAS00739
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. pickup coil resistance
8. main switch
9. engine stop switch
10. neutral switch
11. sidestand switch
12. relay unit (diode)
13. wiring
(of the entire ignition system)
D
Before troubleshooting, remove the following
part(-s):
1) battery cover
2) rider’s seat
3) fuel tank
4) steering head side covers
5) tool box cover
6) left side cover
7) cylinder head covers
D
Troubleshoot with the following special
tool(-s).
Ignition checker
90890-06754
Pocket tester
90890-03112
EAS00738