20 TROUBLESHOOTING
116
Faults Possible cause Action
Engine does not speed up The carburetor is flowing over
because the float needle is
dirty or worn
(50 SX)
– Check/set the carburetor compo-
nents.
(50 SX Mini)
– Check/set the carburetor compo-
nents.
Loose carburetor jets
(50 SX)
– Check/set the carburetor compo-
nents.
(50 SX Mini)
– Check/set the carburetor compo-
nents.
Fault in ignition system – Check the ignition system.
Engine has too little power Fuel supply interrupted – Check the fuel tank breather.
– Clean the fuel tap.
(50 SX)
– Check/set the carburetor compo-
nents.
(50 SX Mini)
– Check/set the carburetor compo-
nents.
Air filter very dirty – Clean the air filter and air filter box.
( p. 59)
Exhaust system leaky,
deformed or too little glass
fiber yarn filling in main
silencer
– Check exhaust system for damage.
– Change the glass fiber yarn filling of
the main silencer. ( p. 60)
Ignition system defective – Check the ignition coil.
– Check the spark plug connector.
Diaphragm or reed valve hous-
ing damaged
– Check the diaphragm and reed valve
housing.
Noticeable wear – Overhaul the engine.
Clutch engagement speed too
low or too high
– Check the clutch setting. ( p. 97)
Engine stalls or is popping into
the carburetor
Lack of fuel – Turn the knurled screw on the fuel tap
all the way counterclockwise.
– Fill up with fuel. ( p. 26)
Engine takes in bad air – Check the intake flange and carburetor
for tightness.
The connector or ignition coil is
loose or oxidized
– Clean the plug-in connection and treat
it with contact spray.
Engine overheats Too little coolant in cooling sys-
tem
– Check the cooling system for leakage.
– Check the coolant level. ( p. 90)
Too little air stream – Switch off engine when standing.
Radiator fins very dirty – Clean radiator fins.
Foam formation in cooling sys-
tem
– Drain the coolant. ( p. 90)
– Refill with coolant. ( p. 91)
Damaged cylinder head or
cylinder head gasket
– Check the cylinder head or cylinder
head gasket.
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