Yamaha YZ85(R)/LC Owner's Service Manual page 452

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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
Check entire ignition
system for connection.
Check engine stop switch.
Check ignition coil.
Check spark plug cap.
Check CDI magneto.
Replace CDI unit.
*marked: Only when the ignition checker is used.
NOTE:
Remove the following parts before inspection.
G
1) Seat
2) Fuel tank
Use the following special tools in this inspection.
G
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
No spark
OK
OK
Primary coil
Secondary coil
OK
OK
Pickup coil
Charging coil
OK
IGNITION SYSTEM
Spark
No good
No good
No good
No good
No good
No good
No good
Pocket tester:
YU-3112-C/90890-03112
6 - 2
+
ELEC
*Clean or replace
spark plug.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.

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