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How to troubleshoot
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SYMPTOM
Engine does not start
Exhaust noise decreases: en-
gine tends to stop with throttle
fully opened
The engine does not run smoo-
thly / Irregular engine exhaust
The
engine
detonates
makes backfiring noises while
accelerating or when running
up hill
High fuel consumption
96
DUNE125 | DUNE X125
ENG
POSSIBLE CAUSES
Irregular or weak ignition
Air filter stuck or dirty
Spark plug damaged
Irregular engine performance
and
Mixture too rich
Air filter stuck or dirty
Other causes (EFI, low compres-
sion, etc.)
PROCEDURE
Remove the spark plug and af-
ter connecting it to the ignition
with the specific cap (placing
one end of it in contact with
any metal part away form its
housing of the cylinder head)
check that when starting the
engine without load, ignites a
spark between the electrodes.
In the opposite case, repeat
the operation with a new spark
plug before proceeding to ot-
her operations of the ignition
system controls
Replace the air filter element
Replace the spark plug
Clean and replace the spark
plug
Check the wires that feed pow-
er and their connections to the
main control
Check the air filter element and
replace it if necessary
Replace the filter element
Visit your nearest Dealer or
Distributor
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