HYOSUNG MS3 250 Sercie Manual page 226

Complaint
Dirty or heavy
exhaust smoke
Slipping clutch
◉ ◉ RADIATOR (COOLING SYSTEM)
Complaint
Engine overheats.
Engine overcools.
Symptom and possible causes
1. Too much engine oil in the engine.
2. Worn piston rings or cylinder.
3. Worn valve guides.
4. Cylinder wall scored or scuffed.
5. Worn valves stems.
6. Defective stem seals.
7. Worn side rails.
1. Worn or damaged clutch shoes.
2. Weakened clutch shoe springs.
3. Worn clutch housing.
4. Worn or slipping drive belt.
Symptom and possible causes
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.
1. Defective cooling fan thermo-switch.
2. Extremely cold weather.
3. Defective thermostat.
SERVICING INFORMATION 9-8
Remedy
Check with inspection win-
dow, drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Remedy
Add coolant.
Clean.
Repair or replace.
Replace.
Clean.
Bleed out air.
Replace.
Replace.
Replace.
Replace.
Put on the radiator cover.
Replace.