KYMCO XCITING 500 Service Manual page 27

1
. GENERAL INFORMATION
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
Inspection/Adjustment
Check ignition timing
Check carburetor pilot
screw adjustment
Check carburetor gasket
for air leaks
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground
Check carburetor air
cut-off valve
Symptom
Correct timing
Correctly adjusted
No air leak
Good spark
Good
Incorrect timing
Incorrectly adjusted
Air leaks
Weak or inter-
mittent spark
Faulty
XCITING 500
Probable Cause
Faulty ignition unit
Faulty A.C. generator
Mixture too rich (turn screw
out)
Mixture too lean (turn screw
in)
Damaged insulator rubber
Carburetor not securely
tightened
Faulty intake manifold gasket
Deformed carburetor O-ring
Faulty or fouled spark plug
Faulty ignition unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted high
tension wire
Faulty ignition switch
Damaged air cut-off valve
diaphragm
Damaged air cut-off valve
spring
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