Troubleshooting - KYMCO MX 125 Service Manual

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1
. GENERAL INFORMATION

TROUBLESHOOTING

ENGINE WILL NOT START OR IS HARD TO START
Inspection/Adjustment
Check if fuel reaches
carburetor by loosening
drain screw
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground
Test cylinder
compression
Start engine by
follow-ing normal
starting procedure
Remove spark plug and
inspect again
1-23
Symptom
Fuel reaches
carburetor
Spark jumps
Weak or no spark
Normal
compression
Engine does not
fire
Dry spark plug
Fuel does not
reach carburetor
Low or no
compression
Engine fires but
does not start
Wet spark plug
MX'er SYSTEM
Probable Cause
Empty fuel tank
Clogged fuel line between fuel
tank and carburetor
Clogged float oil passage
Clogged fuel tank cap breather
hole
Clogged fuel filter
Clogged fuel valve passage
Faulty spark plug
Fouled spark plug
Faulty CDI unit
Faulty change gear control unit
Faulty pulser coil
Broken or shorted ignition coil
Broken or shorted exciter coil
Faulty ignition switch
Weak or dead battery
Faulty starter clutch
Valve clearance too small
Valve stuck open
Worn cylinder, piston and piston
rings
Leaking cylinder head gasket
Air leaking through intake pipe
Leaking intake manifold
Incorrect ignition timing
Incorrectly adjusted air*/ screw
Flooded carburetor
Clogged air cleaner
Throttle valve excessively open

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Mx150

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