4 Loosen the central screw (5) fastening the float
chamber (6) and carefully collect all the petrol
left in the float chamber.
5 Pull out the pin (7), dismount the float (8) and
remove the gasket (9).
6 Undo the screw (10) and pull out the jet (11).
7 Clean the jet and the carburettor thoroughly by
immersing them in clean petrol (or a detergent)
for 24 hours. Dry with compressed air, blowing
well through the carburettor holes.
8 Mount the carburettor following the previous
points 6, 5 and 4 in reverse order, remembering
that:
– It is always advisable to replace the gasket (9)
and the washer underneath the screw (5);
– the float (8) must oscillate freely on the pin (7);
– the jet (11) should never be modified or
replaced with others even if they seem to
have the same specifications;
– the choke (12) must open and close regularly;
– the float chamber drain screw (13) must be
facing forwards.
9 When fitting the carburettor back on the engine,
always replace the grommet (14) on the mani-
fold side and the gasket (15) on the filter side.
10 Remount the tie rods (1) and (2) and check that
the governor system moves smoothly without
stopping.
11 Remount the conveyor [ 6.1.A
].
12 Remount the air filter [ 6.3.B
].
B) Replacing the carburettor
– Follow steps 1 - 2 - 3 - 9 - 10 - 11 - 12 of the
procedure described in point “A”.
SV 150
6.4.0
CARBURATION
2 / 3
WORKSHOP MANUAL
page
from
2004 to ••••
01/2005
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