Vespa GT 125 User Manual

Inspecting the by-pass valve
- Check the unloaded spring length.
- Check that the small piston is not scored.
- Ensure that it slides freely on the crankcase and that it guarantees a good seal.
- If not, eliminate any impurities or replace defective parts.
Characteristic
By-pass check up: Standard length
54.2 mm
Refitting the oil sump
- Refit the by-pass valve plunger in its housing.
- Insert the pressure-regulating spring.
- Fit a new sump seal.
- Refit the two centring dowels.
- Refit the sump, taking care to locate the spring in
the appropriate recess machined into the inside of
the sump.
- Refit the rear brake cable brackets and the
screws in the reverse order from which they were
removed.
- Tighten the screws to the prescribed torque.
- Refit the drive pulley assembly, the drive belt, the
sprocket wheel and the transmission cover, as de-
scribed in the "Transmissions" chapter.
Engine Vespa GT 125-200
ENG - 162

Vespa GT 125 Specifications

General

Displacement	124 cc
Transmission	Automatic CVT
Rear Brake	140 mm drum
Seat Height	790 mm
Engine Type	Single cylinder, 4-stroke
Cooling System	Air-cooled
Fuel System	Electronic injection
Front Suspension	Single arm with coil spring and hydraulic shock absorber
Rear Suspension	hydraulic shock absorber