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.
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