KYMCO VITALITY 50 Manual page 43

2
. 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
VITALITY 50
Clutch slipping
Mixture too lean
Ignition timing too early
Probable Cause
Faulty CDI unit
Faulty pulser coil
The woodruff key in the
crankshaft is not fixed position.
Mixture too rich (turn screw
out)
Mixture too lean (turn screw in)
Deteriorated O-ring
Carburetor is 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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