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Vespa 150 - Vespa 150 Fault Finding: Explosions, Clutch, and Starter Issues; Explosions and Mixture Issues; Clutch Troubles; Gear Pinion Disengagement

Vespa 150
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,
e"
localing the trouble
Remedies
Remarks
3. - Explosions
at
silencer and carburettor
Sparking plug carbon-coated or with excessive
Replace
or clean thc
plug
and correct the
electrode gap.
gap to
.6 mm.
(.023 in) ..
Carbon
pearls
011
spark plug
insulation
Clean
Pre-ignition
Re-time
the
ignition *
Condenser screw loose
!
.
Tip of
contact
breaker loose
\
Not enough mixture flowing to the carburettor
See
paragraph
cHard
starting_
N. 1.
4. - Clutch
troubles
a) Clutch
snatches
. To be car-
Con"ex plates wronglJ' asse-mbIed
Turn convex face
towards spring cups.
Tied
Gear pinions
lubricated
properly
Top up
oil
level
and
that the screw
on
out
not
see
by. a sale
draining
hole is
tightened (see
Fig. 16).
b) Clutch
slips
agent
Springs
feeble
Replace .
.. ese suita-
Plates with
cork-inserts
"rorn
or burnt
Replace both
plates
and
springs .
ble wire
c) Clutch does
not
disengage
completely brush
or
Excessh e play
on control cable
Adjust .
('merypa-
Exc"cssh'ccOD\"cxit.of convex steel plates
Replace .
per.
S. - Gear pinions
dlsengago
of own accord
Gear change
control cables
out of adjustment
Adjust .
Gear shifter
loose on crankcase
Tighten
lhe screws
Spring of stirrup broken, feeble or missing
Replace
Excessive play between actuating arm and gear
Replace.
sbift flange. or wronJt orientation of arm.
Selector arrr.s chamfered
R<place
the
selector *
Dogs of gear
pinions
chipped
or worn
Replacc
the
pinions *
6.- Starter
assembly
not
engaging
Visit ,)"ouragent

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