PIAGGIO Vespa 1955, Service Station Manual, Page: 38 / 232

GROUP
in which lhe fault is verified
Engine
( See chart at page 16).
14
FAULT FINDING AND REMEDIES
INSTRUCTIONS VALID FOR ALL VEHICLES
Instructions relative to operations to be carried out
- In cases of poor performance, lack of compression and
escape of gases, always check that the nuts and screws
securing the relative engine organs are always well tigh­
tened ( carburettor, cylinder head, muffler attachment).
- On substituting spark plug, use the type recommended
on the table at pag. 7.
It is to be remembered that many engine faults derive
from inappropriate sparking plugs and the use of fuel
mixtures with unsuitable oils or with an oil percentage
different to that prescribed.
- The max. gap between the contact breaker points should
enter between the limits of 0.3 and 0.5 mm (0".011
0.019); the spark advance should correspond to that
indicated on the table at page 7 ( for engine timing see
the instructions at the section « Re - assembly
» :
- With reference to the clutch and gear box it is important
that the play on the controls be checked ( see Overhauls)
and that the cables are not frayed or rusted; in cases of
slipping or
«
snatching
»
clutch, check springs, plates, oil
level in gear box; for gear box, check the parts of the
transmission in correspondence to the gear selector.
NOTES
For the general instruc­
tions on the vehicles main­
tenance, see the table at
page 9.
0