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9.2 Engine malfunctions
Malfunction
Possible cause
Remedy
Engine does not
start
Fuel tank empty
Check, fill up if necessary
Fuel system clogged
Clean the fuel screen in the tank
Replacing the fuel filter
Check the fuel screen in the carburettor
Have checked by qualified expert per-
sonnel
Set the engine stop switch to position
"OFF"
Set the engine stop switch to position
"ON"
Engine oil level too low
(The engine oil level warning lamp lights)
Check the engine oil level, correct if nec-
essary
No ignition spark
Clean the spark plug, replace if neces-
sary
Check the ignition coil
Have checked by qualified expert per-
sonnel
Engine stop switch defective
Have checked by qualified expert per-
sonnel
No fuel in carburettor
Check the fuel supply
Have checked by qualified expert per-
sonnel
Engine does not
crank when oper-
ating the recoil
starter
Recoil starter defective
Replace the recoil starter
Spring broken
Replace the recoil starter
Starter rope of
recoil starter does
not return to initial
position
Recoil starter dirty
Clean the recoil starter
Insufficient pre-tension of the spring
Check the pre-tension of the spring,
adjust if necessary
Spring broken
Replace the recoil starter
Engine stops fre-
quently in short
intervals
Fuel system clogged
Clean the fuel screen in the tank
Replacing the fuel filter
Check the fuel screen in the carburettor
Have checked by qualified expert per-
sonnel
Tank lid ventilation defective
Check that the tank lid ventilation is open,
if necessary replace the tank lid
Poor fuel quality
Check the fuel quality, if necessary
change the fuel
Engine does not
run with full speed
Throttle cable defective
Have checked by qualified expert per-
sonnel
Troubleshooting – Engine malfunctions
BVT 65
91
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