Yamaha YFM660FS, Supplementary Service Manual

Page: 424 / 478

9 - 10
– +
ELEC
IGNITION SYSTEM
EB802010
TROUBLESHOOTING
Procedure
Check:
1.Fuse (main, ignition)
2.Battery
3.Spark plug
4.Ignition spark gap
5.Spark plug cap resistance
6.Ignition coil resistance
IF THE IGNITION SYSTEM FAILS TO OPERATE (NO SPARK OR INTERMITTENT SPARK):
7.Engine stop switch
8.Main switch
9.Pickup coil resistance
10.Charging/rotor rotation direction detection
coil resistance
11.Wiring connection (the entire ignition sys-
tem)
NOTE:
●
Remove the following part(s) before trouble-
shooting:
1)Seat
2)Fuel tank side panels
3)Front carrier
4)Front fender
●
Use the following special tool(s) for trouble-
shooting.
Dynamic spark tester:
P/N. YM-34487
Ignition checker:
P/N. 90890-06754
Pocket tester:
P/N. YU-03112, 90890-03112
EB802011
CONTINUITY
1.Fuse (main, ignition)
Refer to “CHECKING THE SWITCH”.
NO CONTINUITY
Replace the fuse.
EB802012
CORRECT
2.Battery
●
Check the battery condition.
Refer to “CHECKING THE BATTERY” in
CHAPTER 3.
Open-circuit voltage:
12.8 V or more at 20 °C (68 °F)
INCORRECT
●
Clean the battery terminals.
●
Recharge or replace the battery.
3.Spark plug
●
Check the spark plug condition.
●
Check the spark plug type.
●
Check the spark plug gap.
Refer to “CHECKING THE SPARK PLUG”
in CHAPTER 3.
Standard spark plug:
DPR8EA-9/NGK