DAELIM ROADWIN VJ125 - Engine Wont Start or Is Hard to Start; Troubleshooting

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21. TROUBLESHOOTING
ENGINE WON’T START
OR IS HARD TO START
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ENGINE LACKS POWER
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POOR PERFORMANCE
(AT LOW AND IDLE SPEED)
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POOR PERFORMANCE
(AT HIGH SPEED)
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ENGINE WON’T START OR IS HARD TO START
1. Check fuel flow to carburetor. Fuel not supplied ● Fuel tank empty.
to the carburetor ● Clogged fuel tube or fuel filter.
● Sticking float valve.
● Clogged fuel tank cap hole.
2. Check the spark plug. Weak or no ● Faulty spark plug.
spark ● Contaminated spark plug.
● Faulty CDI unit.
● Disconnected or shorted high tension wires.
● Faulty pulse generator.
● Faulty main switch.
3. Test cylinder compression. Low compression ● Low speed of starter crank.
● Incorrect valve clearance.
● Faulty valve seat.
● Worn cylinder and piston rings.
● Seized valve.
● Improper valve timing.
4. Start by following normal Engine starts ● Improper chock valve operation.
procedure. but stops. ● Improper chock cable free play.
● Carburetor incorrectly adjusted.
● Improper ignition timing.
(Faulty CDI unit or pulse generator.)
● Fuel contaminated.
● Lean fuel mixture.
5. Remove and inspect spark plug. Wet plug ● Carburetor flooded.
● Throttle valve open.
● Choke closed.
● Air cleaner dirty.
● Rich fuel mixture.
Fuel is supplied
Good spark
Compression normal
Engine does not start.
Dry plug
INSPECTION CAUSE OF TROUBLE
6. Close the choke and start
engine again.
POOR HANDLING
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POOR FRONT/REAR SUSPENSION
PERFORMANCE
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FUEL GAUGE
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