Yamaha YZF-R1S, Service Manual

Page: 403 / 457

8-10
YES NO
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?
S
Clean the battery
terminals.
S
Recharge or re-
place the battery.
EAS00739
YES NO
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?
Re-gap or replace
the spark plug.
IGNITION SYSTEM
ELEC
NOTE:
YES NO
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?
Replace the fuse(s).
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. ignition coil resistance
6. crankshaft position sensor
7. main switch
8. engine stop switch
9. neutral switch
10. sidestand switch
11. clutch switch
12. starting circuit cut-off relay (diode)
13. lean angle cut-off switch
14. wiring connections
(of the entire ignition system)
S
Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. side cowlings
S
Troubleshoot with the following special tool(s).
Ignition checker
90890-06754
Dynamic spark tester
YM-34487
Pocket tester
90890-03112, YU-3112
EAS00738