Vespa LX 50 Workshop Manual

Refitting the crankshaft bearings
Heat the bearings in an oil bath at around 150°C
and fit them on the crankshaft, if necessary using
a section of tube that acts on the bearing's inner
track
Specific tooling
020265Y Bearing fitting base
Inspecting the crankshaft alignment
With the specific tool shown check that the eccen-
tricity of the surfaces of diam. «A»-«B»-« C» are
within 0.03 mm. (reading limit on the dial gauge);
in addition, check the eccentricity of diam. «D», for
which a maximum reading of 0.02 mm is permitted.
In the case where eccentricity is not much above
prescribed levels, straighten the shaft by acting
on the counterweights with a shim or tighten them
in a clamp (with an aluminium bushing) as re-
quired..
Specific tooling
020335Y Magnetic support for dial gauge
020074Y Support base for checking crankshaft
alignment
Refitting the crankshaft
- Position the transmission side half crankcase on
two wooden supports
- Using a thermal gun, heat the bearing seat to
about 120°
Vespa LX 50 Engine
ENG - 85

Vespa LX 50 Specifications

General

Engine Type	Single-cylinder, 4-stroke
Displacement	49.9 cc
Fuel System	Carburetor
Front Brake	200 mm disc
Rear Brake	110 mm drum
Seat Height	785 mm
Fuel Tank Capacity	8.6 liters
Tires Front	110/70 - 11"
Tires Rear	120/70 - 10"
Length	1, 770 mm
Width	705 mm
Cooling System	Air cooled
Transmission	Automatic
Max Power	3.2 kW
Max Torque	4.2 Nm