19 TROUBLESHOOTING 87
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 of the main
silencer. ( p. 49)
Ignition system defective – Check the ignition coil.
– Check the spark plug connector.
Diaphragm or reed valve housing
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. 77)
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. 20)
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. 72)
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. 72)
– Refill with coolant. ( p. 73)
Damaged cylinder head or cylinder
head gasket
– Check the cylinder head or cylinder head gas-
ket.
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 or cylinder head gas-
ket.
Gear oil exits at the vent hose Too much gear oil added – Check the gear oil level. ( p. 81)
Water in the gear oil Damaged shaft seal ring or water
pump
– Check the shaft seal ring and water pump.
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