Suzuki DR 125, Service Manual

Page: 166 / 222

7-8 SERVICING INFORMATION
ELECTRICAL
Complaint Symptom and possible causes Remedy
No sparking or poor
sparking. 1. Defective ignition coil.
2. Defective spark plug.
3. Defective generator.
4. Defective CDI unit. Replace.
Replace.
Replace.
Replace.
Spark plug is wet or
quickly becomes
fouled with carbon. 1. Excessively rich air/fuel mixture.
2. Excessively high idling speed.
3. Incorrect gasoline.
4. Dirty air cleaner element.
5. Incorrect spark plug (cold type). Adjust carburetor.
Adjust carburetor.
Change.
Clean or replace.
Change to standard spark
plug.
Spark plug quickly
becomes fouled with
oil or carbon. 1. Worn piston ring.
2. Worn piston.
3. Worn cylinder.
4. Excessive valve-stem-to-valve-guide clearance.
5. Worn valve stem oil seal. Replace.
Replace.
Replace.
Replace.
Replace.
Spark plug electrodes
overheat or burn. 1. Incorrect spark plug (hot type).
2. Overheated engine.
3. Loose spark plug.
4. Excessively lean air/fuel mixture.
Change to cold type spark
plug.
Turn-up.
Tighten.
Adjust carburetor.