Troubleshooting - Yamaha YZF-R6 99 Service Manual

EB802011

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. starting circuit cutoff relay
13. wiring
(of the entire ignition system)
NOTE:
S Before troubleshooting, remove the following
part(-s):
1) rider seat
2) fuel tank
3) air filter case
4) heat protector plate
5) front cowling inner panel (right)
6) side cowling inner panel (right)
7) side cowling (right)
S Troubleshoot with the following special tool
(-s).
Ignition checker
90890-06754
Pocket tester
90890-03112
EB802400
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).
IGNITION SYSTEM
EB802401
2. Battery
S 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
S Is the battery OK?
YES
EB802403
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
CR10EK (NGK)
Spark plug gap
0.6
S Is the spark plug in good condition, is it of the
correct type, and its gap within specification?
YES
8-12
ELEC
NO
S Clean the battery
terminals.
S Recharge or re-
place the battery.
0.7 mm
NO
Re-gap or replace the
spark plug.