VESPA LX 4T USA, Workshop Manual, Page: 111 / 194

- Turn the engine by using the starter for five sec-
onds with the carburettor at minimum.
- Take up the fuel by means of a graded burette.
N.B.
THE MEASUREMENT MAY BE FALSIFIED BY THE INCOR-
RECT NUMBER OF REVS OR BY THE WRONG POSITION
OF THE TUBE.. IN THIS CASE, THE TENDENCY IS TO OB-
TAIN A REDUCED FUEL FLOW RATE. THE SUCTION OUT-
LET ON THE MANIFOLD HAS A SECTION INTENTIONALLY
REDUCED FOR THE PURPOSE OF ENHANCING THE SUC-
TION PULSATION AND THEREBY GUARANTEE A CON-
STANT TAP FLOW RATE.
Specific tooling
020329Y MityVac vacuum-operated pump
Characteristic
Minimum flow rate
20 cc
Removing the carburettor
- To detach the carburettor from the engine, re-
move the two clamps anchoring the carburettor to
the inlet manifold and the air intake coupling to the
filter.
- Remove the fuel supply pipe.
- Disconnect the starter connection.
- Detach the accelerator cable with the sheath that
connects the plate and the support.
- Remove the carburettor.
- Remove the protection, the bracket and the start-
er undoing the screw shown in the figure.
CAUTION
THE CARBURETTOR FEATURES AN ANTIVIBRATION
RUBBER BUFFER FITTED ON THE LOWER SUPPLEMENT
OF THE ACCELERATING PUMP BODY. UPON REFITTING
THE CARBURETTOR ON THE ENGINE, MAKE SURE THIS
BUFFER IS PRESENT SO THAT THE PETROL IN THE TANK
DOES NOT EMULSIFY.
LX 4T USA
Engine
ENG - 111