HYOSUNG TE 450 Service Manual page 231

◉ ◉ CARBURETOR
Complaint
Trouble with
starting.
Idling or low-speed
trouble.
Medium or high
speed trouble.
Overflow and fuel
level fluctuations.
◉ ◉ RADIATOR (COOLING SYSTEM)
Complaint
Engine
overheats.
Engine
overcools.
Symptom and possible causes
1. Starter jet is clogged.
2. Starter pipe is clogged.
3. Air leaking from a joint between starter body and carburetor.
4. Starter plunger is not operating properly.
1. Pilot jet, pilot air jet are clogged or loose.
2. Pilot outlet or bypass is clogged.
3. Starter plunger is not fully closed.
1. Main jet or main air jet is clogged.
2. Needle jet is clogged.
3. Throttle valve is not operating properly.
4. Filter is clogged.
1. Needle valve is worn or damaged.
2. Spring in needle valve is borken.
3. Float is not working properly.
4. Foreign matter has adhered to needle valve.
5. Fuel level is too high or low.
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 8-4
Remedy
Clean.
Clean.
Check starter body and
carburetor for tightness,
adjust and replace gasket.
Check and adjust.
Check and clean.
Check and clean.
Check and clean.
Check and clean.
Check and clean.
Check throttle valve for
operation.
Check and clean.
Replace.
Replace.
Check and adjust.
Clean.
Adjust float height.
Remedy
Add coolant.
Clean.
Repair or replace.
Replace.
Clean.
Bleed out air.
Replace.
Replace.
Replace.
Replace.
Put on the radiator cover.
Replace.