DS 19 OPERATION No. DS 142-3 : Work on the carburettor. Op. DS 142-3 105
TOOLS
8 Clean the parts in petrol and blow out the passages in the carburettor and the different jets carefully with
compressed air.
NOTE – Never use metallic wire to unblock the jets, the holes in these are machined with great precision and
such an action may modify their output.
Assembly (see Pl. 26).
9 To assemble the cover (21) on the carburettor.
a) Fit the needle valve seat (26), interposing the aluminium joint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm box spanner
b) Put the needle valve (25) in position.
c) Put the floats (23) in position and fit the pin (24), then carry out the levelling of the floats.
- with the cover (21) of the carburettor turned towards the front, the dimension “a” between the float and
the surface of the cover should be 5 mm ± 0.5 mm.
- when the levelling has been carried out, make sure that the movement of the float (23) is “b” = 12 ± 0.5 mm;
if necessary, modify the position of the stop (50.
d) Put the filter gauze (29) in position, the joint (28), the cover (27) and the screw. Tighten the screw, fitting a
joint under the head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm box spanner
NOTE – If the filter was fitted with a rubber joint, it must be replaced by a joint of the new type.
10 Put the accelerator pump (30) in position and engage the retaining plate (51) as far as possible.
11 Fitting the jets.
a) Put the primary venturi slow running jet (34) in position (diameter = 0.45 mm).
b) Put the primary venturi main jet (32) in position (diameter = 1.05 mm).
Fit a copper joint under the head of the jet carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm box spanner
c) Put the secondary venturi slow running jet (35) in position (diameter = 0.65 mm).
d) Put the secondary venturi main jet (33) in position (diameter = 1.45 mm).
e) Fit the volume screw (3) and the spring (37).
12 Put the emulsion tubes complete (38) in position.
a) The emulsion tube with 220 air jet (primary venturi side).
b) The emulsion tube with 230 air jet, (secondary venturi side) (DCLC carburettor) or with 240 air jet
(DCZCI carburettor) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm box spanner
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