PIAGGIO Vespa 125 1955 Manual Para Estaciones De Servicio página 132

T. 0026482
F
Fig. 24
Balancing opn. of flywheel rotor
Control equilibrio rotor
F) Illustration of where to drill balancing holes
F) Ejemplo de ejecuci6n agujeros para el equilibria.
102
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SUBSTITUTION OF FLYWHEEL HUB AND GROUP
FLYWHEEL FAN ON THE VESPA GS./VSB 1
For the above mentioned substitutions it is not usual­
ly necessary to skim down the external and internal
diameter of the flywheel rotor.
The concentricity of the internal diameter of the ro­
tor with respect to the flywheel axis can be obtained
as follows:
l. - Mate the hub to the flywheel rotor without com­
pletely tightening the securing screws.
2. - Mount the balancing mandrel T. 0028143 ( as in
fig. 24) and set up the assembly between lathe
centres.
Using a clock gauge mounted with extension
arm ( in non magnetic material such as brass)
check the excentricity of the rotors internal dia­
meter: adjust the rotor so as to obtain a reading
of less than 0.05 mm on the clock gauge.
After said operation tighten the bolts securing
the hub to the rotor
3. - With the rotor still mounted on the mandrel
T. 0028143 balance the rotor ( a max out of ba­
lance of 0.3 grm applied to the external dia.
is admissable), by drilling blind holes where
necessary on the pole shoes (see fig. 24).
N. B. - For substituting the flywheel cam of
the Vespa G. · S ./VSB 1, see pages 71 - 177.
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