KYMCO MXU 50 REVERSE - Troubleshooting Engine Issues

1. GENERAL INFORMATION
1-30
ATV 50
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
c Empty fuel tank
d Clogged float valve
e Clogged charcoal canister
f Clogged fuel filter
g Faulty auto fuel valve
c Faulty spark plug
d Fouled spark plug
e Faulty CDI unit
f Faulty A.C. generator
g Broken or shorted ignition coil
h Broken or shorted exciter coil
iFaulty ignition switch
c Burned or worn cylinder
piston
d Faulty reed valve
e Blown cylinder head gasket
f Leaking crankcase
g Faulty crankcase oil seal
c Incorrectly adjusted idle speed
d Air leaking through intake
pipe
e Incorrect ignition timing
c Flooded carburetor
d Throttle valve excessively
open
c Faulty auto bystarter
Check if fuel reaches
carburetor by loosening
drain screw.
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground.
Inspection/Adjustment
Symptom
Probable Cause
Fuel reaches
carburetor
Spark jumps
Dry spark plug
Not clogged
Normal
compression
Engine does no
t
fire
Fuel does no
t
reach carburetor
Weak or no spark
Wet spark plug
Clogged
Low or no
compression
Engine fires bu
t
does not start
Test cylinde
r
compression.
Remove spark plug and
inspect again.
Wait for 30 minutes and
then remove the carbu-
retor auto choke circuit
hose and blow the hose
with mouth.
Start engine by follow-
ing normal starting
p
rocedure.