Yamaha 2005 BT1100 Supplementary Service Manual page 77

EASB0030
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. Wiring (of the entire ignition system)
NOTE:
• Before troubleshooting, remove the following
part(-s):
1) Seat
2) Side covers
3) Fuel tank (lift)
4) Cowling (lift forward)
5) Storage compartment/battery cover
6) Cylinder head covers
• Troubleshoot with the following special tool(-s).
Ignition checker
90890-06754
Pocket tester
90890-03112
EAS00738
1. Main and ignition fuses
• Check the main and ignition fuses for conti-
nuity.
Refer to "CHECKING THE FUSES" in
Chapter 3.
• Are the main and ignition fuses OK?
YES NO
Replace the fuse(-s).
IGNITION SYSTEM
EAS00739
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 (68 °F)
• Is the battery OK?
YES
EAS00741
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 "CHECKING THE SPARK PLUGS"
in Chapter 3.
Standard spark plug
BPR7ES
W22EPR-U
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?
YES
69
ELEC
NO
• Clean the battery ter-
minals.
• Recharge or replace
the battery.
NO
Re-gap or replace
the spark plug.