KYMCO MX 125 - Page 27

1. GENERAL INFORMATION
1-25
MX’er SYSTEM
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
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
Faulty or fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted spark plug
wire
Faulty ignition switch
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
g
round
Symptom
Correctly adjusted
No air leak
Air leaks
Good spark
Weak or inte
r
-
mittent spark
Incorrectly adjusted
Incorrect timing
Correct timing
Probable Cause Inspection/Adjustment
Check ignition timing
Check carburetor ai
r
screw adjustment
Check carburetor gasket
for air leaks