KYMCO MXU 50 REVERSE - Page 37

1. GENERAL INFORMATION
1-34
ATV 50
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
c Faulty CDI unit
d Faulty A.C. generator
c Mixture too rich (turn screw
out)
d Mixture too lean (turn screw
in)
c Carburetor not securely
tightened
d Faulty intake manifold gasket
e Deformed carburetor O-ring
c Faulty or fouled spark plug
d Faulty CDI unit
e Faulty A.C. generator
f Faulty ignition coil
g Broken or shorted high
tension wire
h Faulty ignition switch
c Broken auto bystarter wire
d Faulty auto bystarter
Inspection/Adjustment Symptom Probable Cause
Clogged
Not clogged
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground.
Check ignition timing.
Connect auto
b
ystarte
r
wire to battery. Wait for
5 minutes, then connect
a hose to fuel enriching
circuit and then blow
the hose with mouth.
Remove auto
b
ystarte
r
connecting wire and
check if bypass fuel
line is clogged.
Check carburetor gaske
t
for air leaks.
Check carburetor ai
r
screw adjustment.
Correct timing
Incorrect timing
Correctly adjusted
Incorrectly adjusted
No air leak
Air leaks
Good spark
Weak or inter-
mittent spark
Not clogged
Clogged