High Fuel Consumption - VESPA GTV 125 Service Station Manual

Vespa GTV 125
Possible Cause
Pressure too low at the end of compression
Faulty spark plug or incorrect ignition advance
The starter remains on
Minimum nozzle dirty

High fuel consumption

Possible Cause
Loose nozzles
Fuel pump failure
Inefficient Starter
Air filter blocked or dirty
Incorrect float level
Transmission and brakes
Clutch grabbing or performing inadequately
IRREGULAR CLUTCH PERFORMANCE OR SLIPPAGE
Possible Cause
Faulty clutch
Insufficient braking
Possible Cause
Inefficient braking system
Check the thermal group seals and replace worn
Replace the spark plug or check the ignition circuit
Check: electric wiring, circuit not interrupted, me-
chanical movement and power supply; replace if
Wash the nozzle with solvent and dry with com-
HIGH FUEL CONSUMPTION
Check the maximum and minimum nozzles are
Check: electric wiring, circuit continuity, mechani-
Remove the sponge, wash with water and car
shampoo, then soak it in a mixture of 50% petrol
and 50% specific oil. Press with your hand without
Restore the level in the tank by bending on the float
the thrusting reed of the petrol inlet rod so as to
have the float parallel to the tank level with the
Check that there is no grease on the masses.
Check that the clutch mass contact surface with
the casing is mainly in the centre with equivalent
characteristics on the three masses. Check that
the clutch casing is not scored or worn in an anom-
INEFFICIENT BRAKING SYSTEM
Check the pad wear (1.5 min). Check that the
brake discs are not worn, scored or warped. Check
the correct level of fluid in the pumps and replace
brake fluid if necessary. Check there is no air in
Operation
components
components
necessary
pressed air
Operation
adequately fixed in their fittings
Check the low-pressure duct sealing
cal sliding and power supply
squeezing, allow it to drip dry and refit.
carburettor inverted.
Operation
alous way
Operation
Troubleshooting
TROUBL - 5