Yamaha XG250, Service Manual

Page: 226 / 278

IGNITION SYSTEM
7-3
EAS27130
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left/right)
3. Fuel tank side cover (left/right)
4. Fuel tank
5. Tool box (left/right)
1. Check the fuse.
Refer to “CHECKING THE FUSE” on
page 7-37.
NG
→
Replace the fuse.
OK
↓
2. Check the battery.
Refer to “CHECKING AND CHARG-
ING THE BATTERY” on page 7-38. NG
→
●
Clean the battery terminals.
●
Recharge or replace the battery.
OK
↓
3. Check the spark plug.
Refer to “CHECKING THE SPARK
PLUG” on page 3-8. NG
→
Re-gap or replace the spark plug.
OK
↓
4. Check the spark plug cap.
Refer to “CHECKING THE SPARK
PLUG CAP” on page 7-43.
NG
→
Replace the spark plug cap.
OK
↓
5. Check the ignition coil.
Refer to “CHECKING THE IGNI-
TION COIL” on page 7-43.
NG
→
Replace the ignition coil.
OK
↓
6. Check the pickup coil.
Refer to “CHECKING THE PICKUP
COIL” on page 7-44. NG
→
Replace the pickup coil.
OK
↓
7. Check the stator coil.
Refer to “CHECKING THE STATOR
COIL” on page 7-44. NG
→
Replace the stator assembly.
OK
↓
8. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 7-33.
NG
→
Replace the main switch.
OK
↓
9. Check the engine stop switch.
Refer to “CHECKING THE
SWITCHES” on page 7-33.
NG
→
Replace the right handlebar switch.
OK
↓