CF MOTO CF500-5, Service Manual

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14 Troubleshooting
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14-9
2. Carburetor
Complaint Symptom and Possible Causes Remedy
Starting Difficulty
1. Clogged starter jet
2. Clogged starter jet passage
3. Air leakage from joint between starter body
and carburetor
4. Faulty starting plunger
Clean
Clean
Clean, adjust or replace gasket
Adjust
Idling or
low-speed
trouble
1. Clogged slow jet
2. Clogged slow jet passage
3. Clogged
air intake
4. Clogged bypass port
5. Starter plunger not fully closed
6. Improper set of idle screw
7. Improper float height
Clean
Clean
Clean
Clean
Adjust
Adjust
Adjust
Medium or high
speed trouble
1. Clogged main jet
2. Clogged main air jet
3. Clogged needle jet
4. Faulty throttle valve
5. Clogged
fuel filter
6. Improper float height
7. Starter plunger not fully closed
Clean
Clean
Clean
Adjust
Clean
Adjust
Adjust
Overflow and fuel
level fluctuation 1. Worn or damaged needle valve
2. Damaged needle valve spring
3. Improper working float
4. Foreign matter in needle valve Replace
Replace
Adjust or Replace
Clean
3.
Cooling System/Radiator
Complaint Symptom and Possible Causes Remedy
Engine overheats
1. Clogged water passage or radiator
2. Air in the cooling system; insufficient
coolant
3. Faulty water pump
4. Incorrect
coolant
5. Faulty thermostat
6. Faulty fan motor or thermoswitch
Clean
Discharge air and add coolant
Check and replace
Replace
Replace
Check and/or replace
Engine coolant
overcools
1. Faulty thermoswitch
2. Extremely cold weather
3. Faulty thermostat
Replace
Put on radiator cover
Replace
4. Ignition System
Complaint Symptom and Possible Causes Remedy
No Sparking or
Weak Sparking
1. Faulty CDI
2. Faulty spark plug
3. Faulty
Generator
4. Insufficient battery voltage
5. Faulty ignition coil
6. Faulty pickup coil
Check and replace
Check and replace
Check and replace
Check and replace
Check and replace
Check and replace