20 TROUBLESHOOTING
102
Faults Possible cause Action
Engine stalls or is popping into the
carburetor
Lack of fuel – Turn the knurled screw on the fuel tap all
the way counterclockwise.
–
Refuel. ( p. 23)
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 system – Check the cooling system for leakage.
–
Check the coolant level. ( p. 82)
Too little air stream – Switch off engine when standing.
Radiator fins very dirty – Clean radiator fins.
Foam formation in cooling system –
Drain the coolant. ( p. 82)
–
Refill with coolant. ( p. 83)
Damaged cylinder head or cylin-
der head gasket
– Check the cylinder head or cylinder head
gasket.
Bent radiator hose – Change the radiator hose.
White smoke emission (steam in
exhaust gas)
Damaged cylinder head or cylin-
der head gasket
– Check the cylinder head or cylinder head
gasket.
Gear oil exits at the vent hose Too much gear oil added –
Check the gear oil level. ( p. 91)
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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