Ignition System - Yamaha WR250F(S) Owner's Service Manual

EC620000

IGNITION SYSTEM

INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure
and for checking the spark plug which will not spark.
*1 Check fuse.
OK
*2 Check battery.
OK
Spark gap test
No spark
Check entire ignition system for
connection.
(couplers, leads and ignition coil)
OK
Check engine stop switch.
OK
Check main switch.
OK
Check ignition coil.
OK
Check AC magneto.
OK
Check neutral switch.
OK
Replace CDI unit.
*1 marked: Refer to "FUSE INSPECTION" section in the CHAPTER 3.
*2 marked: Refer to "BATTERY INSPECTION AND CHARGING" section in the CHAPTER 3.
*3 marked: Only when the ignition checker is used.
NOTE:
• Remove the following parts before inspection.
1) Seat
2) Fuel tank
• Use the following special tools in this inspection.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
Pocket tester:
YU-3112-C/
90890-03112
IGNITION SYSTEM
No good
No good
Spark
No good
No good
No good
Primary coil
Secondary coil
Pickup coil
No good
6 - 8
ELEC
Replace fuse and check
wire harness.
Recharge or replace.
*3 Clean or replace spark
Repair or replace.
No good
No good
No good
Repair or replace.
– +
plug.
Replace.
Replace.
Replace.
Replace.
Replace.