HYOSUNG AQUILA 250 FI, Service Manual, Page: 75 / 90

74
7-4 SERVICING INFORMATION
◉ ◉
ELECTRICAL
Complaint Symptom and possible causes Remedy
No sparking or
poor sparking.
1. Defective ignition coils or spark plug caps.
2. Defective spark plugs.
3. Defective pick-up coil.
4. Defective ECU.
5. Defective TO sensor.
6. Open-circuited wiring connections.
1. Mixture too rich.
2. Idling speed set too high.
3. Incorrect gasoline.
4. Dirty element in air cleaner.
5. Spark plugs too cold.
1. Worn piston rings.
2. Pistons or cylinders worn.
3. Excessive clearance of valve stems in valve guides.
4. Worn stem oil seal.
1. Spark plugs too hot.
2. The engine overheats.
3. Spark plugs loose.
4. Mixture too lean.
1. Lead wires tend to get shorted or open-circuited or loosely
connected at terminals.
2. Grounded or open-circuited stator coils of magneto.
3. Defective regulator / rectifier.
4. Defective cell plates in the battery.
1. Internal short - circuit in the battery.
2. Resistor element in the regulator / rectifier damaged or defective.
3. Regulator / rectifier poorly grounded.
1. Open - or short - circuited lead wirse, or loose lead connections.
2. Short - circuited, grounded or open stator coil.
3. Short - circuited or punctured regulator / rectifier.
1. Lead wire insulation frayed due to vibration resulting in
intermittent shorting.
2. Magneto internally shorted.
3. Defective regulator / rectifier.
1. Battery run down.
2. Defective switch contacts.
3. Brushes not seating properly on commutator in starter motor.
4. Defective starter relay / ignition interlock switch.
5. Defective main fuse.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Inspect FI system.
Adjust fast idle or throttle
stop screw.
Change.
Clean or replace.
Replace by hot type plug.
Replace.
Replace.
Replace.
Replace.
Replace by cold type plug.
Tune up.
Retighten.
Adjust carburetor.
Repair or retighten.
Replace.
Replace.
Replace the battery.
Replace the battery.
Replace.
Clean and tighten ground
connection.
Repair or replace or retighten.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Recharge or replace.
Replace.
Repair or replace.
Replace.
Replace.
Spark plug soon
become fouled
with carbon.
Spark plug
become fouled
too soon.
Magneto charge,
but charging
rate is below the
specification.
Magneto
overcharges.
Magneto does not
charge.
Unstable charging.
Starter switch is
not effective.
Spark plug
electrodes
overheat or burn.