Yamaha Wr250r 2008 Manual

 
IGNITION SYSTEM 
8-1 
EAS27090 
IGNITION SYSTEM 
EAS27100 
CIRCUIT DIAGRAM 

 
IGNITION SYSTEM 
8-2 
1. AC magneto
3. Main switch
4. Battery
5. Main fuse
8.  Right handlebar switch
9.  Engine stop switch
11. Relay unit
12. Sidestand switch
13. Neutral switch
14. Clutch switch
16. ECU
17. Ignition coil
18. Spark plug
27.  Lean angle sensor
56. Ignition fuse 

 
IGNITION SYSTEM 
8-3 
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)
3. Air scoop (left/right) 
4. Fuel tank
1. Check the fuses.
(Main and ignition)
Refer to  
“CHECKING THE FUSES” on 
page 8-67 
.NG 
→ 
Replace the fuse (s).
OK 
↓ 
2. Check the battery.
Refer to  
“CHECKING AND CHARG-
ING THE BATTERY” on page 8-68 
.NG 
→ 
 
Clean the battery terminals. 
...

 
IGNITION SYSTEM 
8-4 
10.Check the sidestand switch.
Refer to  
“CHECKING THE 
SWITCHES” on page 8-63 
.NG 
→ 
Replace the sidestand switch.
OK 
↓ 
11.Check the clutch switch.
Refer to  
“CHECKING THE 
SWITCHES” on page 8-63 
.NG 
→ 
Replace the clutch switch.
OK 
↓ 
12.Check the relay unit.
Refer to  
“CHECKING THE RELAYS” 
on page 8-71 
.NG 
→ 
Replace the relay unit.
OK 
↓ 
13.Check the diode.
Refer to  
“CHECKING THE DIODE” on 
page 8-73 
.NG 
→ 
Replace the relay unit.
OK 
↓ 
14.Check the lean...

 
ELECTRIC STARTING SYSTEM 
8-5 
EAS27160 
ELECTRIC STARTING SYSTEM 
EAS27170 
CIRCUIT DIAGRAM 

 
ELECTRIC STARTING SYSTEM 
8-6 
3. Main switch
4. Battery
5. Main fuse
6. Starter relay
7. Starter motor
8.  Right handlebar switch
9.  Engine stop switch
10. Start switch
11. Relay unit
12. Sidestand switch
13. Neutral switch
14. Clutch switch
55.  Signaling system fuse
56. Ignition fuse 

 
ELECTRIC STARTING SYSTEM 
8-7 
EAS27180 
STARTING CIRCUIT CUT-OFF SYSTEM OPERATION 
If the engine stop switch is set to “ ” and the main switch is set to “ON” (both switches are closed), the
starter motor can only operate if at least one of the following conditions is met: 
 
The transmission is in neutral (the neutral switch is closed). 
 
The clutch lever is pulled to the handlebar (the clutch switch is closed) and the sidestand is up (the
sidestand switch is closed).
The starting circuit cut-off...

 
ELECTRIC STARTING SYSTEM 
8-8 
a.  WHEN THE TRANSMISSION IS IN NEU-
TRAL
b.  WHEN THE SIDESTAND IS UP AND THE 
CLUTCH LEVER IS PULLED TO THE 
HANDLEBAR
1. Battery
2. Main fuse
3. Main switch
4. Ignition fuse
5.  Engine stop switch
6.  Starting circuit cut-off relay
7. Signal fuse
8. Diode
9. Diode
10. Clutch switch
11. Sidestand switch
12. Neutral switch
13. Start switch
14. Starter relay
15. Starter motor 

 
ELECTRIC STARTING SYSTEM 
8-9 
EAS27190 
TROUBLESHOOTING 
The starter motor fails to turn.
NOTE:
 
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left)
3. Air scoop (left/right) 
4. Fuel tank
1. Check the fuses.
(Main, ignition and signal fuse)
Refer to  
“CHECKING THE FUSES” on 
page 8-67 
.NG 
→ 
Replace the fuse (s).
OK 
↓ 
2. Check the battery.
Refer to  
“CHECKING AND CHARG-
ING THE BATTERY” on page 8-68 
.NG 
→ 
 
Clean the battery terminals. 
 
Recharge or...