Poor Performance (Especially At Idle And Low Speeds) - KYMCO VENOX 250 Service Manual

1
. GENERAL INFORMATION

POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)

Inspection/Adjustment
Check ignition timing
Check carburetor pilot
screw adjustment
Check carburetor
insulator rubber for air
leaks
Remove spark plug and
install it into spark plug
cap to test spark by
making it contact the
engine
Check A.C. generator
Symptom
Correct
Correctly adjusted
Incorrectly adjusted
No air leak
Good spark
Good
Faulty CDI unit
Incorrect
Faulty A.C. generator
Mixture too lean (turn screw in)
Mixture too rich (turn screw
out)
Carburetor not securely
tightened
Air leaks
Faulty intake manifold gasket
Deformed carburetor O-ring
Broken vacuum tube
Faulty or fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Weak or inter-
Faulty ignition coil
mittent spark
Broken or shorted high tension
wire
Faulty ignition switch
Faulty A.C. generator
Faulty
Damaged vacuum tube
Clogged air vent hole
VENOX
Probable Cause
1-26
250