Troubleshooting - Yamaha YFM250XL(C) Service Manual

EB802010

TROUBLESHOOTING

IF THE IGNITION SYSTEM FAILS TO OPERATE (NO SPARK OR INTERMITTENT SPARK):
Procedure
Check:
1.Fuse
2.Battery
3.Spark plug
4.Ignition spark gap
5.Spark plug cap resistance
6.Ignition coil resistance
7.Engine stop switch
NOTE:
Remove the following part(s) before trouble-
shooting:
1)Seat
2)Front carrier
3)Front fender
Use the following special tool(s) for trouble-
shooting.
EB802011
1.Fuse
Refer to "SWITCH INSPECTION".
EB802012
2.Battery
Check the battery condition.
Refer to "BATTERY INSPECTION".
Open-circuit voltage:
12.8 V or more at 20 ˚C (68 ˚F)
3.Spark plug
Check the spark plug condition.
Check the spark plug type.
Check the spark plug gap.
Refer to "SPARK PLUG INSPECTION".
*
CONTINUITY
CORRECT
C0NTINUITY
– 42 –
IGNITION SYSTEM
8.Main switch
9.Pickup coil resistance
10. Charging/rotor rotation direction detection
coil resistance
11. Wiring connection
(the entire ignition system)
Dynamic spark tester:
P/N. YM-34487
Pocket tester:
P/N. YU-03112, 90890-03112
NO CONTINUITY
Replace the fuse.
INCORRECT
Clean the battery terminals.
Recharge or replace the battery.
Standard spark plug:
DR7EA
– +
ELEC