Yamaha XG250, Service Manual

Page: 250 / 278

CARBURETOR HEATING SYSTEM
7-27
EAS27510
TROUBLESHOOTING
The carburetor heating system fails to operate.
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)
6. Battery
7. Carburetor
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 main switch.
Refer to “CHECKING THE
SWITCHES” on page 7-33. NG
→
Replace the main switch.
OK
↓
4. Check the thermo switch.
Refer to “CHECKING THE THERMO
SWITCH” on page 7-46.
NG
→
Replace the thermo switch.
OK
↓
5. Check the carburetor warmer.
Refer to “CHECKING THE CARBU-
RETOR WARMER” on page 7-47.
NG
→
Replace the carburetor warmer.
OK
↓
6. Check the entire carburetor heater
system’s wiring.
Refer to “CIRCUIT DIAGRAM” on
page 7-25.
NG
→
Properly connect or repair the carburetor
heater system’s wiring.
OK
↓
This circuit is OK.