TROUBLESHOOTING 20
125
Faults Possible cause Action
Engine has too little power 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 in
the main silencer. ( p. 66)
Fault in ignition system – Check the ignition system.
Diaphragm or reed valve hous-
ing damaged
– Check the diaphragm and reed valve
housing.
Engine stalls or is popping into
the carburetor
Lack of fuel
(All SX models)
– Turn tap handle of the fuel tap to
the ON position.
(125 XC US)
– Turn tap handle of the fuel tap to
the ON position.
(125 XC US)
– Turn tap handle of the fuel tap to
the RES position.
– Refuel. ( p. 34)
Engine takes in bad air – Check the intake flange and carburetor
for tightness.
The connector or ignition coil is
loose or oxidized
– Clean the connector 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. 104)
Too little air stream – Switch off engine when stationary.
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling sys-
tem
– Drain the coolant. ( p. 105)
– Refill with coolant. ( p. 106)
Damaged cylinder head or
cylinder head gasket
– Check the cylinder head and cylinder
head gasket.
Bent radiator hose – Change the radiator hose.
White smoke emission (steam
in exhaust gas)
Damaged cylinder head or
cylinder head gasket
– Check the cylinder head and cylinder
head gasket.
Gear oil exits at the vent hose Too much gear oil added – Check the gear oil level. ( p. 117)
Water in the gear oil Damaged radial shaft seal ring
or water pump
– Check the radial shaft seal ring and the
water pump.
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