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

Brand	Vespa
Model	LX Series
Category	Scooter
Language	English