Troubleshooting - Yamaha YZF-R1 1998 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. relay unit
13. wiring
(of the entire ignition system)
NOTE:
• Before troubleshooting, remove the
following part(-s):
1) rider seat
2) fuel tank
3) air filter case
4) ignition coil plate and ignition coils
5) front cowling inner panel (left)
6) windshield
• Troubleshoot with the following spe-
cial tool(-s).
Ignition checker
90890-06754
Pocket tester
90890-03112
EB802400
1.Main and ignition fuses
• Check the main and ignition fuses for
continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main and ignition fuses OK?
YES
NO
Replace the fuse(-s).
IGNITION SYSTEM
EB802401
2.Battery
• 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
• Is the battery OK?
EB802403
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
PLUGS" in chapter 3.
Standard spark plug
CR9E (NGK)
U27ESR-N (DENSO)
Spark plug gap
0.7 ~ 0.8 mm
• Is the spark plug in good condition, is it
of the correct type, and its gap within
specification?
8 - 12
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
"CHECKING THE
YES
Re-gap or replace
the spark plug.
– +
NO
SPARK
NO