21 TROUBLESHOOTING
136
Faults Possible cause Action
Engine does not speed up Loose carburetor jets – Check/set the carburetor compo-
nents.
Fault in ignition system – Check the ignition system.
Engine has too little power Fuel feed interrupted – Check the fuel tank breather.
– Clean the fuel tap.
– Check/set the carburetor compo-
nents.
Air filter very dirty – Clean the air filter and air filter box.
( p. 68)
Exhaust system leaky,
deformed or too little glass
fiber yarn filling in main
silencer
– Check exhaust system for damage.
– Change glass fiber yarn filling in the
main silencer. ( p. 70)
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 –
Turn handle
1
of the fuel
tap to the ON position.
(Figure H02505-10 p. 20)
–
Turn handle
1
of the fuel
tap to the RES position.
(Figure H02505-10 p. 20)
– Refuel. ( p. 39)
Engine takes in bad air – Check the intake flange and carbure-
tor for tightness.
The connector or ignition coil
is loose or oxydized
– Clean the connector and treat with
contact spray.
Engine overheats Too little coolant in cooling
system
– Check the cooling system for leakage.
– Check the coolant level. ( p. 113)
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. 113)
– Refill with coolant. ( p. 114)
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. 128)
Water in the gear oil Damaged shaft seal ring or
water pump
– Check the shaft seal ring and water
pump.
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