Vespa LX Series User Manual

Slot packing system
- Provisionally fit the piston into the cylinder, without any base gasket.
- Assemble a dial gauge on the specific tool
- Set the dial gauge to zero at a contrast plane with an average preload, for example 5 mm. Keeping
the zero setting position, fit the tool on the cylinder and lock it with 2 nuts, as shown in the figure.
- Rotate the crankshaft up to the TDC (the inversion point of the dial gauge rotation)
- Calculate the difference between the two measurements: use the chart below to identify the thickness
of the cylinder base gasket to be used for refitting. Correctly identify the cylinder base gasket thickness
to keep the correct compression ratio.
- Remove the special tool and the cylinder.
Characteristic
Compression ratio (125/150)
10.6 ± 0.5 to 1
SHIMMING SYSTEM (125)
Specification
Desc./Quantity
Value measured 0 to 0.1
Thickness 0.8 ± 0.05
Value measured 0.1 to 0.3
Thickness 0.6 ± 0.05
Value measured 0.3 - 0.4
Thickness 0.4 ± 0.05
SHIMMING SYSTEM (150)
Specification
Desc./Quantity
Value measured 1 to 1.1
Thickness 0.8 ± 0.05
Value measured 1.1 to 1.3
Thickness 0.6 ± 0.05
Vespa LX 125 - 150 i.e. Characteristics
CHAR - 19

Vespa LX Series Specifications

General

Displacement	124 cc
Cooling System	Air-cooled
Front Tire	110/70 - 11"
Rear Tire	120/70 - 10"
Seat Height	785 mm
Kerb Weight	114 kg
Wheelbase	1, 280 mm
Length	1, 770 mm
Width	705 mm
Height	1, 140 mm
Engine Type	Single-cylinder, 4-stroke
Fuel System	Carburetor
Max Torque	10.4 Nm @ 6, 000 rpm
Transmission	Automatic
Front Suspension	Single-sided trailing arm with hydraulic shock absorber
Rear Suspension	Hydraulic shock absorber
Front Brake	200mm disc brake
Rear Brake	110mm drum brake