KYMCO Bet & Win 250 Manual page 20

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
1-19
www.PlanDeGraissage.org
Symptom
Correct timing
Incorrectly adjusted
Correctly adjusted
No air leak
Good spark
Good
ÅFaulty CDI unit
Incorrect timing
ÇFaulty A.C. generator
ÅMixture too rich (turn screw
ÇMixture too lean (turn screw
ÅDamaged insulator rubber
ÇCarburetor not securely
Air leaks
ÉFaulty intake manifold
ÑDeformed carburetor O-ring
ÅFaulty or fouled spark plug
ÇFaulty CDI unit
ÉFaulty A.C. generator
Weak or inter-
ÑFaulty ignition coil
mittent spark
ÖBroken or shorted high
ÜFaulty ignition switch
ÅDamaged air cut-off valve
Faulty
ÇDamaged air cut-off valve
Bet & Win 250
Probable Cause
out)
in)
tightened
gasket
tension wire
diaphragm
spring