Electrical - Suzuki RM-z450 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.
Magneto does
charge, but charg-
ing rate is below the
specification.
Magneto over-
charges
Unstable charging
Symptom and possible causes
• Defective ignition coil
• Defective spark plug
• Defective CKP sensor
• Defective ECM
• Defective TO sensor
• Open-circuited wiring connections
• Mixture too rich
• Idling speed set too high
• Incorrect gasoline
• Dirty air cleaner elements
• Too cold spark plug
• Worn piston ring
• Worn piston or cylinder
• Excessive clearance of valve stems in valve guides
• Worn valve stem seal
• 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 charge coil
• Short-circuited or punctured regulator/rectifier
• Lead wires tend to get shorted or open-circuited or
loosely connected at terminals
• Grounded or open-circuited charge coil
• Defective regulator/rectifier
• Damaged or defective regulator/rectifier
• Poorly grounded regulator/rectifier
• Lead wire insulation frayed due to vibration, result-
ing in intermittent short-circuiting
• Internally shorted magneto
• Defective regulator/rectifier
TROUBLESHOOTING
Remedy
Replace
Replace
Replace
Replace
Replace
Repair or replace
Inspect FI system
Adjust idle screw
Change
Clean or replace
Replace with hot type plug
Replace
Replace
Replace
Replace
Replace with cold type plug
Tune up
Retighten
Inspect FI system
Repair or replace or
retighten
Replace
Replace
Repair or retighten
Replace
Replace
Replace
Clean and tighten ground
connection
Repair or replace
Replace
Replace
3-11