HYOSUNG 2010 ST7, Service Manual

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SERVICING INFORMATION 9-10
Complaint Symptom and possible causes Remedy
Dirty or heavy
exhaust smoke.
Slipping clutch.
1. Too much engine oil in the engine.
2. Worn piston rings or cylinders.
3. Worn valve guides.
4. Cylinder wall scored or scuffed.
5. Worn valves stems.
6. Defective stem seals.
7. Worn side rails.
1. Weakened clutch springs.
2. Worn or distorted pressure plates.
3. Distorted clutch plates or pressure plates.
1. Some clutch springs weakened while others are not.
2. Distorted pressure plates or clutch plates.
1. Broken gearshift cam.
2. Distorted gearshift forks.
3. Worn gearshift pawl.
1. Broken return spring on shift shaft.
2. Rubbing or sticky shift shaft.
3. Distorted or worn gearshift forks.
1. Worn shifting gears on driveshaft or countershaft.
2. Distorted or worn gearshift forks.
3. Weakened stopper spring on gearshift stopper.
Check with inspection win-
dow, drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Dragging clutch.
Transmission will
not shift.
Transmission will
not shift back.
Transmission
jumps out of
gear.
RADIATOR (COOLING SYSTEM)
Complaint Symptom and possible causes Remedy
Engine over-
heats.
1. Not enough engine coolant.
2. Radiator core clogged with dirt or scale.
3. Faulty cooling fan.
4. Defective cooling fan thermo-switch.
5. Clogged water passage.
6. Air trapped in the cooling circuit.
7. Defective water pump.
8. Use of incorrect engine coolant.
9. Defective thermostat. Add coolant.
Clean.
Repair or replace.
Replace.
Clean.
Bleed out air.
Replace.
Replace.
Replace.
Engine over-
cools.
1. Defective cooling fan thermo-switch.
2. Extremely cold weather.
3. Defective thermostat. Replace.
Put on the radiator cover.
Replace.