High Fuel Consumption - PIAGGIO MSS X9 Evolution 250 Workshop Manual

MSS X9 Evolution 250
Engine tends to cut-off at idle
Excessive exhaust noise
Depression intake pipe of the secondary air device disconnec-
Reed valve of the secondary air device does not close correctly
and wears out the rubber coupling between the device and the

High fuel consumption

SAS malfunctions
Depression intake pipe of the secondary air device disconnec-
Reed valve of the secondary air device does not close correctly
and wears out the rubber coupling between the device and the
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Possible Cause
Incorrect timing
Cut off device failure
Incorrect idle adjustment
Pressure too low at the end of compression
Faulty spark plug or incorrect ignition advance
The starter remains on
Minimum nozzle dirty
Possible Cause
Secondary air device cut-off valve not working
ted or dented
head pipe
HIGH FUEL CONSUMPTION
Possible Cause
Float level
Loose nozzles
Fuel pump failure
Starter inefficient
Air filter blocked or dirty.
A
NOMALIES IN THE SECONDARY AIR DEVICE
Possible Cause
Secondary air device cut-off valve not working
ted or dented
head pipe
manuals search engine
ENGINE STOP IDLING
Time the system and check the timing system components
Check that the following parts work properly: valve; diaphragm;
spring; and that the air calibration elements are clean; check if
the sponge filter is clean too
Adjust using the rpm indicator
Check the thermal group seals and replace worn components
Replace the spark plug or check the ignition circuit components
Check: electric wiring, circuit not interrupted, mechanical
movement and power supply; replace if necessary
Wash the nozzle with solvent and dry with compressed air
EXCESSIVE EXHAUST NOISE
Replace the secondary air device
Replace the device and the coupling
Restore the level in the tank by bending on the float the thrust-
ing reed of the petrol inlet rod so as to have the float parallel to
the tank level with the carburettor inverted.
Check the maximum and minimum nozzles are adequately
Check that there is no fuel in the low-pressure duct
Check: electric wiring, circuit continuity, mechanical sliding and
Dismantle the sponge, wash with water and shampoo, then
soak it in a mixture of 50% petrol and 50% of specific oil (Se-
lenia Air Filter Oil), then hand dry without squeezing, allow to
drip dry and then reassemble.
Replace the secondary air device
Replace the device and the coupling
Troubleshooting
Operation
Operation
Replace the pipe
Operation
fixed in their fittings
power supply
Operation
Replace the pipe
TROUBL - 49