71
2. POOR PERFORMANCE
Symptom
Possible cause
Remedy
The engine stalls when the speed is
increased.
The smoke is thin.
Backfiring.
The fuel filter is clogged.
The fuel has run out.
The exhaust muffler is blocked with oil
deposits.
Clean the fuel filter and fuel lines.
Refuel the fuel tank.
Remove oil deposits.
Have the carburettor adjusted by an
authorized workshop.
Low compression.
The piston, piston ring or cylinder is
worn.
Have the engine repaired by an
authorized workshop.
Engine leakage.
The contact surface of the cylinder and
crankshaft leaks.
Have the engine repaired by an
authorized workshop.
Leakage of one of the crankshaft
seals.
Defective sealing.
Have the seal replaced by an authorized
workshop.
3. IRREGULAR ENGINE OPERATION
Symptom
Possible cause
Remedy
A metallic noise is heard.
The piston, piston ring or cylinder is
worn.
The piston or piston pin is worn.
The crankshaft bearing is worn.
Have the engine repaired by an
authorized workshop.
Have the engine repaired by an
authorized workshop.
Have the bearing replaced by an
authorized workshop.
The engine overheats.
Overload.
The combustion chamber is fouled with
oil deposits.
Unsuitable fuel.
Avoid long-term operation at high speed
and high load.
Have the oil deposits removed by an
authorized workshop.
Use gasoline of the correct octane
number.
Mix a fuel mixture in the correct
gasoline/oil ratio.
The engine ignition misfires.
Water in fuel.
Incorrect spark plug gap.
Change the fuel.
Adjust the gap between the electrodes
of the spark plug to 0.6 - 0.7 mm.
4. ENGINE SUDDENLY STOPS
Possible
cause
Remedy
The fuel has run out.
The spark plug is fouled with oil deposits and short-circuited.
The high-voltage cable is disconnected
.
Refuel the fuel tank.
Have the oil deposits removed by an authorized workshop.
Reconnect the high-voltage cable.
