Yamaha YZF-R1 98, Service Manual

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ELEC
IGNITION SYSTEM
EB802011
TROUBLESHOOTING
Check:
1. m ain 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. m ain sw itch
9. engine stop sw itch
10. neutral sw itch
11. sidestand sw itch
12. relay unit
13. w iring
(of the entire ignition system )
NOTE:
• Before troubleshooting, rem ove the
follow ing part(-s):
1) rider seat
2) fuel tank
3) air filter case
4) ignition coil plate and ignition coils
5) front cow ling inner panel (left)
6) w indshield
• Troubleshoot w ith the follow ing spe-
cial tool(-s).
The ignition system fails to operate (no
spark or intermittent spark).
Ignition checker
90890-06754
Pocket tester
90890-03112
EB802400
YES NO
1.M ain and ignition fuses
• Check the m ain and ignition fuses for
continuity.
Refer to “ CHECKING THE FUSES” in
chapter 3.
• Are the m ain and ignition fuses OK?
Replace the fuse(-s).
EB802401
YES
NO
2.Battery
• Check the condition of the battery.
Refer to “ CHECKING AND CHARGING
THE BATTERY” in chapter 3.
M in. open-circuit voltage
12.8 V or more at 20 ˚C
• Is the battery OK?
• Clean the battery
term inals.
• Recharge or
replace the battery.
EB802403
YES NO
3.Spark plugs
The follow ing procedure applies to all of
the spark plugs.
• Check the condition of the spark plug.
• Check the spark plug type.
• M easure the spark plug gap.
Refer to “ CHECKING THE SPARK
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 w ithin
specification?
Re-gap or replace
the spark plug.