Ignition System; Inspection Steps - Yamaha YZ250(N)/LC Owner's Service Manual

EC620000

IGNITION SYSTEM

EC621002

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"
button.
OK
Check ignition coil.
OK
Check CDI magneto.
OK
Replace CDI unit.
*marked: Only when the ignition checker is used.
NOTE:
9Remove the following parts before inspection.
1) Seat
2) Fuel tank
9Use the following special tools in this inspection.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
IGNITION SYSTEM
Spark
No good
No good
Primary coil
Secondary coil
Pick-up coil
Source coil
6-2
ELEC
*Clean or replace
spark plug.
Repair or replace.
No good
No good
No good
No good
Pocket tester:
YU-3112-C/90890-03112
Replace.
Replace.
Replace.
Replace.
Replace.