Poor Performance (Especially At Idle And Low Speeds) - KYMCO SUPER8 50 2T Service Manual

2
. GENERAL INFORMATION

POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)

Inspection/Adjustment
Check ignition timing.
Check carburetor air
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.
Remove auto
bystarter connecting
wire and check if
bypass fuel line is
clogged.
Connect auto bystarter
wire to battery. Wait
for 5 minutes, then
connect a hose to fuel
enriching circuit and
then blow the hose
with mouth.
2-25
Symptom
Correct timing
Correctly adjusted
No air leak
Good spark
Not clogged
Clogged
Incorrect timing
Incorrectly adjusted
Air leaks
Weak or inter-
mittent spark
Clogged
Not clogged
SUPER8 50 2T
Probable Cause
Faulty CDI unit
Faulty A.C. generator
Mixture too rich (turn screw
out)
Mixture too lean (turn
screw in)
Carburetor not securely
tightened
Faulty intake manifold
gasket
Deformed carburetor O-
ring
Faulty or fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted high
tension wire
Faulty ignition switch
Broken auto bystarter wire
Faulty auto bystarter