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Vehicle
Mod. VS 1 -
vs
vs
2 -
3
vs
vs
4 -
5
40
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Fault
Defective carburation
- Where defective carburation is verified on Vespa G. S.
Lack of power
-·- If on engines of vehicles prior to VS 5 T - 0069272 the
Damage to crankshaft
- - With defective crankshafts which necessitate substitution,
Operations to carry out
It is to be noted that on these latter vehicles the stop
bulb should be of 5 W and therefore on overhauling, the
fore mentioned bulbs should substitute the existing 10 W
bulbs.
prior to VS 4 T - 0046001 substitute, the slow running jet
of 50/100 mm with one of 45/100 mm and the existing
float chamber housing with a part countersigned by the
letter
A
this latter component has the channel con
«
» (
necting the main jet choked with an apposite tube).
For vehicles between VS4 T - 0046000 and VS5 T - 0061473,
substitute the slow running jet of 40 / 100 with one of
45/100.
high turbulence cylinder head » is to be fitted for im�
«
proving engine performance, proceed according to the
technical instruction No. 3 of the Spare Parts List of the
Vespa G. S.
assemble the new type which have the con - rod and crank
pin mounted with a roller cage and spacer washers in
bronze ( externally visible).
For vehicle models VS 1 - VS 2 - VS 3 - VS 4 the pre-exi
sting crankshafts can still be used after overhauling.
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