TROUBLESHOOTING 73
Faults Possible cause Action
Engine stalls or is popping into the
carburetor.
Lack of fuel – Refuel. ( p. 25)
Engine takes in bad air – Check rubber sleeves and carburetor for tight-
ness.
Engine overheats. Too little coolant in cooling system – Check the cooling system for leakage.
– Check the coolant level. ( p. 63)
Too little air stream – Switch off engine when standing.
Radiator fins very dirty – Clean radiator fins.
Bent radiator hose –
Change the radiator hose. x
Thermostat defective –
Check the thermostat. x
Guideline
Opening temperature: 70 °C (158 °F)
Defect in radiator fan system – Check the radiator fan fuse.
–
Check the radiator fan. x
–
Check the thermostat. x
Engine has too little power Fuel feed interrupted – Check the fuel tank breathers.
– Check the fuel filter.
– Check the fuel sieve of the fuel tanks.
– Clean the fuel tap.
–
Check/adjust the carburetor components. x
–
Check the fuel pump. x
Air filter very dirty –
Clean the air filter. x
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. x
Valve clearance too little –
Adjust the valve clearance. x
Ignition system defective –
Check the ignition coil. x
–
Check the CDI unit. x
–
Check the spark plug connector. x
–
Check the pulse generator. x
–
Check the generator. x
High oil consumption Engine vent hose bent – Route the vent hose without bends or replace it
if necessary.
Engine oil level too high – Check the engine oil level. ( p. 67)
Engine oil too thin (low viscosity) – Change the engine oil and filter, clean the oil
screens. x ( p. 67)
Piston or cylinder is worn – Check the piston/cylinder mounting
clearance. x
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