Electrical - Suzuki RM-Z250 Owner's Service Manual

ELECTRICAL

Complaint
No sparking or poor
sparking
Spark plug soon
become fouled with
carbon.
Spark plug become
fouled too soon.
Spark plug elec-
trodes overheat or
burn
Magneto does not
charge.
Symptom and possible causes
• Defective ignition coil/plug cap
• Defective spark plug
• Defective CDI unit
• Defective magneto
• Open-circuited wiring connections
• Mixture too rich
• Idling speed set too high
• Incorrect gasoline
• Dirty air cleaner element
• Too cold spark plug
• Worn piston ring
• Worn piston or cylinder
• Excessive clearance of valve stems in valve guides
• Worn stem seals
• Too hot spark plug
• Overheated the engine
• Loose spark plug
• Too lean mixture
• Open- or short-circuited lead wires, or loose lead
connections
• Short-circuited, grounded or open stator coil
TROUBLESHOOTING
Remedy
Replace
Replace
Replace
Replace
Check and repair
Carburetor tuning
Adjust throttle stop screw
Change
Replace
Replace with hot type plug
Replace
Replace
Replace
Replace
Replace with cold type plug
Tune up
Retighten
Carburetor tuning
Repair or replace
Replace
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