TROUBLESHOOTING 81
Faults Possible cause Action
Engine has too little power. Air filter very dirty –
Clean the air filter. x ( p. 71)
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
– Check exhaust system for damage.
– Change glass fiber yarn filling of 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 ignition pulse generator. x
–
Check the generator. x
Engine stalls or is popping into the
carburetor
Lack of fuel – Turn handle of the fuel tap to the ON posi-
tion. (Figure 500137-10 p. 22)
– Fill up with fuel. ( p. 30)
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. 68)
Too little air stream – Switch off engine when standing.
Radiator fins very dirty – Clean radiator fins.
Foam formation in cooling system –
Drain the coolant. x ( p. 69)
–
Refill the coolant. x ( p. 69)
Bent radiator hose –
Change the radiator hose. x
Thermostat defective –
Check the thermostat. x
Guideline
Opening temperature: 70 °C (158 °F)
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. 75)
Engine oil too thin (low viscosity) – Change the engine oil and oil filter and clean
the engine oil screen. x ( p. 75)
Piston or cylinder is worn – Piston/cylinder - determine the mounting clear-
ance x
Battery discharged The battery does not charge –
Check the charging voltage. x
–
Check the charging current. x
–
Check the generator. x
Undesired power consumer –
Check the closed current. x
Speedometer values deleted (time,
stop watch, lap times)
The battery in the speedometer is
empty.
– Change the battery in the speedometer.
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