KYMCO MOVIE 125 Manual page 24

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 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
Probable Cause
Faulty CDI unit
Faulty pulser coil
Mixture too rich (turn screw
out)
Mixture too lean (turn screw
in)
Deteriorated O-ring
Carburetor not securely
tightened
Damaged insulator rubber
Broken vacuum tube
Faulty or fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted spark plug
wire
Faulty ignition switch
Faulty air cut-off valve
Damaged vacuum tube
Clogged or damaged air vent
hole
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