Yamaha DT200L 1984-1988 Service Manual page 182

ELEC
IGNITION SYSTEM
Troubleshooting
If the ignition system should become inoperative
(No spark or intermittent spark), the
troubleshooting aids will be useful.
Check spark gap using Electro
Tester (Refer to "Ignition Spark
Gap Test" section.)
If other than
specified
Check entire ignition system for
connections (Refer to "WIRING
DIAGRAM" section.)
OK
Poor
connection
Ignition system circuit is good.
Correct.
OK
Check spark plug condition (Refer
to "Spark Plug Inspection"
section.)
OK
Check resistance of ignition coil
(Refer to "Ignition Coil Resistance
Test" section.)
Poor
condition
If other
than
specified
Replace spark plug.
Replace ignition coil.
OK
Check pick-up and source coil
resistance of CDI magneto (Refer
to "Pick-up Coil Resistance Test"
and "Source Coil Resistance Test"
section.)
OK
CDI unit is faulty, replace it.
If other
than
specified
Replace pick-up coil and/or source
coil.
7-8