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21 TROUBLESHOOTING 119
Faults Possible cause Action
Engine stalls or is popping into the
carburetor
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 system Check the cooling system for leakage.
Check the coolant level. ( p. 103)
Too little air stream Switch off engine when stationary.
Radiator fins very dirty Clean the radiator fins.
Foam formation in cooling system Drain the coolant. ( p. 103)
Refill with coolant. ( p. 104)
Damaged cylinder head or cylinder
head gasket
Check the cylinder head and cylinder head gas-
ket.
Bent radiator hose Change the radiator hose.
Incorrect ignition point due to loose
stator
(All 125 models)
Adjust the ignition.
White smoke emission (steam in
exhaust gas)
Damaged cylinder head or cylinder
head gasket
Check the cylinder head and cylinder head gas-
ket.
Gear oil exits at the vent hose Too much gear oil added Check the gear oil level. ( p. 111)
Water in the gear oil Damaged shaft seal ring or water
pump
Check the shaft seal ring and water pump.
121


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