DAELIM NS125DLX Service Manual page 185

Poor Performance at Low Speed and Idling
1. Check ignition timing.
Normal
2. Check the carburetor air screw
Correct
3. Check the area around the
manifold for air leakage.
No leak
4. Check sparks.
Sparks normal.
Poor Performance at High Speed
1. Check ignition timing
Correct
2. Remove the fuel tube from the
fuel valve.
Fuel flows
3. Remove the carburetor, and
Check for clogged jets.
Not clogged
Abnormal
Incorrect
Leaking
Weak or intermittent
sparks
Incorrect
Insufficient fuel
supply
Clogged
Troubleshooting
Cause of Trouble
(1) Faulty CDI unit
(2) Faulty A.C. generator
(1) Excessive fuel mixture
(Loosen screw to correct
adjustment level)
(2) Lean fuel mixture
(Tighten screw to correct
adjustment level)
(1) Faulty insulator packing
(2) Loose carburetor
(3) Faulty inlet pipe packing
(4) Faulty insulator O-ring
(1) Carbon deposited on spark plugs
or spark plugs contaminated
(2) Faulty CDI unit
(3) Faulty ignition coil
(4) Faulty A.C. generator
(5) Disconnected or shorted high
tension cord
(6) Faulty main switch
Cause of Trouble
(1) Faulty CDI unit
(2) Faulty A.C. generator
(1) Fuel tank empty
(2) Fuel tube or fuel filter clogged
(3) Fuel tank cap air hole clogged
(1) Clean
20-3