14. Troubleshooting
14-2
1.
Engine Common Failure Diagnosis
Complaint
Symptom and Possible Causes
Remedy
Engine
will
not
start of is hard to
start
Compression is Too Low
1. Worn cylinder
2. Worn piston ring
3. Leakage with cylinder gasket
Wear valve guide or improper valve
seating
4. Loose spark plug
5. Slow cranking of starting motor
6. Faulty valve timing
7. Improper valve clearance
No Sparking from Spark Plug
1. Fouled spark plug
2. Wet spark plug
3. Defective ignition coil
4. Open or short circuit with pickup coil
5. Faulty generator
6. Faulty CDI
No Fuel Reach Into Carburetor
1. Clogged fuel tank vent tube
2. Clogged or faulty fuel valve
3. Faulty carburetor needle valve
4. Clogged fuel hose
5. Clogged fuel filter
Transfer is not in Neutral position
Replace
Replace
Replace
Repair or Replace
Tighten
Check electrical part
Adjust
Adjust
Clean or Replace
Clean and dry or replace
Replace
Replace
Replace
Replace
Clean or Replace
Clean or Replace
Replace
Replace
Clean or Replace
Set to Neutral position
Engine stalls easily
or has
unstable
Idle speed
1. Improper valve clearance
2. Improper valve seating
3. Faulty valve guide
4. Worn rocker arm or rocker arm shaft
5. Fouled spark plug
6. Improper spark plug gap
7. Faulty ignition coil
8. Faulty CDI
9. Faulty generator
10. Improper fuel level in float chamber
11. Clogged carburetor jet
12. Faulty fuel valve
13. Improper adjustment or idle screw
Adjust
Replace or Correct
Replace
Replace
Replace
Replace or Adjust
Replace
Replace
Replace
Adjust Fuel level
Clean
Replace
Adjust
Summary of Contents for 500ATV
Page 1: ...Service Manual 500ATV 500ATV 2 4 4 ...
Page 16: ...1 SERVICE INFORMATION 1 14 ...
Page 17: ...1 SERVICE INFORMATION 1 15 1 ...
Page 18: ...1 SERVICE INFORMATION 1 16 ...
Page 32: ...2 Vehicle body Muffler 2 14 Visible Parts ...
Page 53: ...4 COOLING SYSTEM 4 7 Cooling System Chart 4 ...
Page 63: ...6 Engine Removal Inspection Installation 6 1 Wu Yang 500 CC engine maintenance manual 6 ...
Page 71: ......
Page 72: ......
Page 73: ...6 Engine Removal Inspection Installation 6 11 Engine information 6 ...
Page 190: ...11 BATTERY CHARGING SYSTEM 11 9 Layout for All Electricity Equipment in Vehicle ...
Page 192: ...12 IGNITION SYSTEM 12 2 Ignition System Diagram ...
Page 200: ...12 IGNITION SYSTEM 12 10 Layout for Ignition System Equipment in Vehicle ...
Page 212: ...13 Lighting Instruments Switches 13 12 500ATV Circuit Diagram ...