CF MOTO CF500-5B 2009, Service Manual, Page: 250 / 272

13 - 2
CFMOTO
1 .
Engine troubleshooting
Complaint Symptom and Possible Causes Remedy
Engine will not start
or is hard to start
Compression is Too Low
1 .
Worn cylinder Replace
2 .
Worn piston ring Replace
3 .
Leakage with cylinder gasket Replace
4 .
Wear valve guide or improper valve seating Repair or Replace
5 .
Loose spark plug Tighten
6 .
Slow cranking of starting motor Check electrical part
7 .
Faulty valve timing Adjust
8 .
Improper valve clearance Adjust
No Sparking from Spark Plug
1. Fouled spark plug Clean or Replace
2. Wet spark plug Clean and dry or replace
3. Defective ignition coil Replace
4. Open or short circuit with pickup coil Replace
5. Faulty generator Replace
No Fuel Reach Into Carburetor
1. Clogged fuel tank vent tube Clean or Replace
2. Clogged or faulty fuel valve Clean or Replace
3. Faulty carburetor needle valve Replace
4. Clogged fuel hose Replace
5. Clogged fuel filter Clean or Replace
Transfer is not in Neutral position Set to Neutral position
Engine stalls easily or
has unstable idle
speed
1. Improper valve clearance Adjust
2. Improper valve seating Replace or Correct
3. Faulty valve guide Replace
4. Worn rocker arm or rocker arm shaft Replace
5. Fouled spark plug Replace
6. Improper spark plug gap Replace or Adjust
7. Faulty ignition coil Replace
8. Clogged idle-vale inlet & exhaust pipe Adjust Fuel level
9. Faulty magneto
Replace