Yamaha WR250F Manuel D'atelier page 608

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.
Spark gap test
No spark
Check entire ignition
system for connection.
OK
Check engine stop switch.
OK
Check ignition coil.
OK
Check CDI magneto.
OK
Check neutral switch.
OK
Replace CDI unit.
*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
All manuals and user guides at all-guides.com
Spark
No good
No good
Primary coil
Secondary coil
Pickup coil
Charging coil
No good
6 - 3
IGNITION SYSTEM
No good
No good
No good
No good
Pocket tester:
YU-3112-C/90890-03112
– +
ELEC
*Clean or replace
spark plug.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.