DAELIM VJF125, Service Manual

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21-3
TROUBLESHOOTING
POOR PERFORMANCE (AT LOW AND IDLE SPEED)
INSPECTION CAUSE OF TROUBLE
Not contaminated or not
discolored.
Contaminated or
discolored
Lean fuel mixture.
Using spark plug with on incorrect heat
range.
9. Check the spark plug.
Level normal
Level low or high
Oil level too high.
Oil level too low.
Contaminated oil.
10. Check oil level.
Valve train lubricated properly.
Valve train lubricated
improperly. Oil level too low.
Contaminated oil.
Faulty oil pump.
Clogged oil passage.
11. Remove cylinder head
30mm hole cap, and inspect
lubrication.
Not overheated.
Overheated
Excessive carbon build-up in combustion
chamber.
Poor quality fuel being used.
Lean fuel mixture.
Clutch slipping.
12. Check for engine overheating.
Correct
Incorrect
Incorrect valve clearance.
Faulty ECU unit.
Faulty pulse generator.
1. Check ignition timing and
valve clearance.
No leak
Leaking Faulty insulator O-ring.
Loose throttlebody.
2. Check inlet pipe for leakage.
Sparks normal.
Weak or intermittent
sparks Carbon depasited on spark plug or spark
plug contaminated.
3. Check sparks.
Engine does not knocking.
Engine knocking
Worn piston ring and cylinder.
Lean fuel mixture.
Excessive carbon build-up in cambustion
chamber.
Incorrect ignition timing.
13. Accelerate or run at high
speed.
INSPECTION CAUSE OF TROUBLE